SEGMENTS Segment Descriptions - Our operations are divided into three reportable business segments, as follows:  our Natural Gas Gathering and Processing segment gathers, treats and processes natural gas;  our Natural Gas Liquids segment gathers, treats, fractionates and transports NGLs and stores, markets and distributes NGL products; and  our Natural Gas Pipelines segment operates regulated interstate and intrastate natural gas transmission pipelines and natural gas storage facilities. Other and eliminations consist of corporate costs, the operating and leasing activities of our headquarters building and related parking facility and eliminations necessary to reconcile our reportable segments to our Consolidated Financial Statements. Accounting Policies - The accounting policies of the segments are described in Note A of the Notes to Consolidated Financial Statements in our Annual Report. Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated: Three Months Ended March 31, 2019 Natural Gas Gathering and Processing Natural Gas Liquids (a) Natural Gas Pipelines (b) Total Segments ( Thousands of dollars ) NGL and condensate sales $ 332,332 $ 2,158,103 $  $ 2,490,435 Residue natural gas sales 319,036  970 320,006 Gathering, processing and exchange services revenue 39,742 98,534  138,276 Transportation and storage revenue  52,322 103,470 155,792 Other 3,551 2,541 11,960 18,052 Total revenues (c) 694,661 2,311,500 116,400 3,122,561 Cost of sales and fuel (exclusive of depreciation and operating costs) (450,913 ) (1,846,673 ) (1,755 ) (2,299,341 ) Operating costs (94,247 ) (110,438 ) (36,268 ) (240,953 ) Equity in net earnings (loss) from investments (1,202 ) 17,544 27,139 43,481 Noncash compensation expense and other 3,945 5,706 1,132 10,783 Segment adjusted EBITDA $ 152,244 $ 377,639 $ 106,648 $ 636,531 Depreciation and amortization $ (52,681 ) $ (46,401 ) $ (14,156 ) $ (113,238 ) Total assets $ 6,208,883 $ 10,220,412 $ 2,138,759 $ 18,568,054 Capital expenditures $ 215,148 $ 639,338 $ 28,688 $ 883,174 (a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segments regulated operations had revenues of $323.1 million , of which $270.0 million related to sales within the segment, and cost of sales and fuel of $118.5 million . (b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segments regulated operations had revenues of $70.1 million and cost of sales and fuel of $5.6 million . (c) - Intersegment revenues for the Natural Gas Gathering and Processing, Natural Gas Liquids and Natural Gas Pipelines segments totaled $335.8 million , $3.5 million and $3.9 million , respectively. Three Months Ended March 31, 2019 Total Segments Other and Eliminations Total ( Thousands of dollars ) Reconciliations of total segments to consolidated NGL and condensate sales $ 2,490,435 $ (338,351 ) $ 2,152,084 Residue natural gas sales 320,006  320,006 Gathering, processing and exchange services revenue 138,276  138,276 Transportation and storage revenue 155,792 (2,521 ) 153,271 Other 18,052 (1,731 ) 16,321 Total revenues (a) $ 3,122,561 $ (342,603 ) $ 2,779,958 Cost of sales and fuel (exclusive of depreciation and operating costs) $ (2,299,341 ) $ 342,964 $ (1,956,377 ) Operating costs $ (240,953 ) $ 212 $ (240,741 ) Depreciation and amortization $ (113,238 ) $ (920 ) $ (114,158 ) Equity in net earnings from investments $ 43,481 $  $ 43,481 Total assets $ 18,568,054 $ 366,271 $ 18,934,325 Capital expenditures $ 883,174 $ 6,531 $ 889,705 (a) - Noncustomer revenue for the three months ended March 31, 2019, totaled $22.3 million related primarily to gains reclassified from accumulated other comprehensive loss from commodity derivative contracts. Three Months Ended March 31, 2018 Natural Gas Gathering and Processing Natural Gas Liquids (a) Natural Gas Pipelines (b) Total Segments ( Thousands of dollars ) NGL and condensate sales $ 413,157 $ 2,552,770 $  $ 2,965,927 Residue natural gas sales 254,997  4,919 259,916 Gathering, processing and exchange services revenue 38,429 83,258  121,687 Transportation and storage revenue  53,478 98,338 151,816 Other 1,408 2,963 6,654 11,025 Total revenues (c) 707,991 2,692,469 109,911 3,510,371 Cost of sales and fuel (exclusive of depreciation and operating costs) (492,622 ) (2,281,072 ) (5,454 ) (2,779,148 ) Operating costs (88,359 ) (88,592 ) (33,190 ) (210,141 ) Equity in net earnings from investments 1,668 16,424 22,095 40,187 Other 1,873 2,850 263 4,986 Segment adjusted EBITDA $ 130,551 $ 342,079 $ 93,625 $ 566,255 Depreciation and amortization $ (47,748 ) $ (42,427 ) $ (13,269 ) $ (103,444 ) Total assets $ 5,462,305 $ 8,370,364 $ 2,060,700 $ 15,893,369 Capital expenditures $ 111,729 $ 124,921 $ 19,898 $ 256,548 (a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segments regulated operations had revenues of $300.0 million , of which $253.4 million related to sales within the segment, and cost of sales and fuel of $122.8 million . (b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segments regulated operations had revenues of $68.0 million and cost of sales and fuel of $9.1 million . (c) - Intersegment revenues for the Natural Gas Gathering and Processing, Natural Gas Liquids and Natural Gas Pipelines segments totaled $397.8 million , $9.0 million and $2.1 million , respectively. Three Months Ended March 31, 2018 Total Segments Other and Eliminations Total ( Thousands of dollars ) Reconciliations of total segments to consolidated NGL and condensate sales $ 2,965,927 $ (408,910 ) $ 2,557,017 Residue natural gas sales 259,916 2,250 262,166 Gathering, processing and exchange services revenue 121,687 (21 ) 121,666 Transportation and storage revenue 151,816 (2,094 ) 149,722 Other 11,025 481 11,506 Total revenues (a) $ 3,510,371 $ (408,294 ) $ 3,102,077 Cost of sales and fuel (exclusive of depreciation and operating costs) $ (2,779,148 ) $ 411,122 $ (2,368,026 ) Operating costs $ (210,141 ) $ (63 ) $ (210,204 ) Depreciation and amortization $ (103,444 ) $ (793 ) $ (104,237 ) Equity in net earnings from investments $ 40,187 $  $ 40,187 Total assets $ 15,893,369 $ 538,978 $ 16,432,347 Capital expenditures $ 256,548 $ 7,919 $ 264,467 (a) - Noncustomer revenue for the three months ended March 31, 2018, totaled $(9.0) million related primarily to losses reclassified from accumulated other comprehensive loss from commodity derivative contracts. Three Months Ended March 31, 2019 2018 ( Thousands of dollars ) Reconciliation of net income to total segment adjusted EBITDA Net income $ 337,208 $ 266,049 Add: Interest expense, net of capitalized interest 115,420 115,725 Depreciation and amortization 114,158 104,237 Income taxes 77,934 75,771 Noncash compensation expense 5,540 9,226 Other corporate costs and noncash items (13,729 ) (4,753 ) Total segment adjusted EBITDA $ 636,531 $ 566,255