Segment Information The Company has three reportable segments: web presence, domain and email marketing. The products and services included in each of the three reportable segments are as follows: Web Presence . The web presence segment consists primarily of the Company's web hosting brands, the largest of which are Bluehost and HostGator. This segment also includes related products such as domain names, website security, website design tools and services, and e-commerce products. Domain . The domain segment consists of domain-focused brands such as Domain.com, ResellerClub and LogicBoxes as well as certain web hosting brands that are under common management with domain-focused brands. This segment sells domain names and domain management services to resellers and end users, as well as premium domain names, and also generates advertising revenue from domain name parking. It also resells domain names and domain management services to the web presence segment. Email Marketing . The email marketing segment consists of Constant Contact email marketing tools and related products and our SinglePlatform digital storefront solution. The Company measures profitably of these segments based on revenue, gross profit, and adjusted EBITDA. The Company's segments share certain resources, primarily related to sales and marketing, engineering and general and administrative functions. Management allocates these costs to each respective segment based on a consistently applied methodology. The CODM does not use asset information to allocate resources or make operating decisions. The accounting policies of each segment are the same as those described in the summary of significant accounting policies, refer to Note 2: Summary of Significant Accounting Policies , for further details. The following tables contain financial information for each reportable segment for the years ended December 31, 2016 , 2017 and 2018 : Year ended December 31, 2016 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 648,732 $ 326,808 $ 135,602 $ 1,111,142 Gross profit 312,067 173,163 41,921 527,151 Net loss (22,161 ) (55,857 ) (3,211 ) (81,229 ) Interest expense, net (2) 68,617 81,469 2,226 152,312 Income tax expense (benefit) (78,901 ) (33,543 ) 2,586 (109,858 ) Depreciation 33,590 23,747 3,023 60,360 Amortization of other intangible assets 72,733 64,679 6,150 143,562 Stock-based compensation 41,481 12,403 4,383 58,267 Restructuring expenses 1,625 22,379 220 24,224 Transaction expenses and charges 31,260 984 40 32,284 Gain of unconsolidated entities (3) (565 )   (565 ) Impairment of other long-lived assets (4) 9,039   9,039 Adjusted EBITDA $ 156,718 $ 116,261 $ 15,417 $ 288,396 Year Ended December 31, 2017 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 641,993 $ 401,250 $ 133,624 $ 1,176,867 Gross profit 305,588 254,941 12,408 572,937 Net income (loss) (64,962 ) (10,615 ) (24,207 ) (99,784 ) Interest expense, net (2) 67,491 86,914 2,001 156,406 Income tax expense (benefit) 4,063 5,152 (26,496 ) (17,281 ) Depreciation 37,634 13,912 3,639 55,185 Amortization of other intangible assets 60,277 74,467 5,610 140,354 Stock-based compensation 46,641 6,934 6,426 60,001 Restructuring expenses 9,131 5,581 1,098 15,810 Transaction expenses and charges  773  773 (Gain) loss of unconsolidated entities (110 )   (110 ) Impairment of other long-lived assets 600  30,860 31,460 SEC investigations reserve 4,323 2,751 926 8,000 Shareholder litigation reserve     Adjusted EBITDA $ 165,088 $ 185,869 $ (143 ) $ 350,814 Year Ended December 31, 2018 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 605,315 $ 410,052 $ 129,924 $ 1,145,291 Gross profit 297,590 288,023 38,941 624,554 Net (loss) income (22,534 ) 38,628 (11,560 ) 4,534 Interest expense, net (2) 70,956 68,317 9,118 148,391 Income tax expense (benefit) (4,961 ) 115 (1,400 ) (6,246 ) Depreciation 32,915 11,497 3,795 48,207 Amortization of other intangible assets 47,020 53,100 3,028 103,148 Stock-based compensation 16,000 9,638 3,426 29,064 Restructuring expenses 2,135 589 644 3,368 Transaction expenses and charges     Gain of unconsolidated entities 267   267 Impairment of other long-lived assets     SEC investigation reserve     Shareholder litigation reserve 4,780 1,500 1,045 7,325 Adjusted EBITDA $ 146,578 $ 183,384 $ 8,096 $ 338,058 (1) Revenue excludes intercompany sales of domain sales and domain services from the domain segment to the web presence segment of $7.6 million , $10.3 million and $10.0 million , for fiscal years 2016 , 2017 and 2018 , respectively. (2) Interest expense includes impact of amortization of deferred financing costs, original issue discounts and interest income. For the years ended December 31, 2017 and 2018 , it also includes $6.5 million and $1.2 million , respectively, of deferred financing costs and OID immediately expensed upon the 2017 Refinancing and 2018 Refinancing. (3) The (gain) loss of unconsolidated entities is reported on a net basis for the years ended December 31, 2017 and 2018 . The year ended December 31, 2016 includes an $11.4 million gain on the Company's investment in WZ UK, Ltd. This gain was generated on January 6, 2016, when the Company increased its ownership stake in WZ UK from 49% to 57.5% , which required a revaluation of its existing investment to its implied fair value. This gain was offset by the following: a loss of $4.8 million on an investment in AppMachine, which was generated on July 27, 2016, when the Company increased its ownership stake in AppMachine from 40% to 100% , which required a revaluation of the existing investment to its implied fair value; a loss of $4.7 million on the impairment of the Company's 33% equity investment in Fortifico Limited; and the Company's proportionate share of net losses from unconsolidated entities of $1.3 million . (4) The impairment of other long-lived assets for the year ended December 31, 2016 includes $7.0 million of impairment charges related to developed and in-process technology related to the Webzai acquisition, and $2.0 million of internally developed software that was abandoned. The impairment of other long-lived assets for the year ended December 31, 2017 includes $13.8 million related to certain domain name intangible assets, $0.6 million to write off a debt investment in a privately held entity, $12.1 million related to impairment of goodwill associated with the domain segment, and $4.9 million related to developed technology and customer relationships associated with the Directi acquisition. The Company has revised amounts reported for gross profit, net loss and adjusted EBITDA for the web presence and the domain segments in the segment disclosures, which impacted fiscal years 2016 and 2017. The amounts reported for the email marketing segment were not impacted. The revisions arose because of an error in the classification of certain domain registration expenses. Domain segment gross profit, net income (loss) and adjusted EBITDA were overstated by $3.0 million for fiscal year 2016, and by $6.9 million for fiscal year 2017, and web presence segment gross profit, net income (loss) and adjusted EBITDA were understated by equal amounts. Consolidated results were not impacted by this misstatement. The following table reflects the differences between the amounts as reported and the amounts as revised for gross profit, net loss and adjusted EBITDA for the web presence and domain segments for the years ended December 31, 2016 and 2017: Year Ended December 31, 2016 Web presence Domain (in thousands) (as reported) (as revised) (as reported) (as revised) Gross profit $ 309,116 $ 312,067 $ 44,872 $ 41,921 Net loss (24,382 ) (22,161 ) (990 ) (3,211 ) Adjusted EBITDA 153,766 156,718 18,369 15,417 Year Ended December 31, 2017 Web presence Domain (in thousands) (as reported) (as revised) (as reported) (as revised) Gross profit $ 298,687 $ 305,588 $ 19,309 $ 12,408 Net loss (70,375 ) (64,962 ) (18,794 ) (24,207 ) Adjusted EBITDA 158,187 165,088 6,758 (143 ) Geographic and Other Information Revenue, classified by the major geographic areas in which the Company's customers are located, was as follows: Year Ended December 31, 2016 2017 2018 (in thousands) United States $ 787,915 $ 845,305 $ 833,657 International 323,227 331,562 311,634 Total $ 1,111,142 $ 1,176,867 $ 1,145,291 The following table presents the amount of tangible long-lived assets by geographic area: 2017 2018 (in thousands) United States $ 89,325 $ 87,301 International 6,127 4,974 Total $ 95,452 $ 92,275 The Companys revenue is generated primarily from products and services delivered on a subscription basis, which include web hosting, domains, website builders, search engine marketing, email marketing and other similar services. The Company also generates non-subscription revenue through domain monetization and marketing development funds. Non-subscription revenue decreased from $41.5 million , or 4% of total revenue for the year ended December 31, 2016 to $39.4 million , or 3% of total revenue for the year ended December 31, 2017 , and decreased to $35.1 million , or 3% of total revenue for the year ended December 31, 2018 . The majority of the Company's non-subscription revenue is included in its domain segment. No individual international country represented more than 10% of total revenue in any period presented. Furthermore, substantially all of the Company's tangible long-lived assets are located in the United States.