11. Segment Information We operate in three reportable geographic operating segments: North America; EMEA; and APAC with PCM being included in our North America and EMEA segments. Our offerings in North America and certain countries in EMEA and APAC include IT hardware, software and services. Our offerings in the remainder of our EMEA and APAC segments are largely software and certain software-related services. The following table summarizes net sales by offering for North America, EMEA and APAC for the three and nine months ended September 30, 2019 and 2018 (in thousands): North America EMEA APAC Three Months Ended September 30, Three Months Ended September 30, Three Months Ended September 30, Sales Mix 2019 2018 2019 2018 2019 2018 Hardware $ 1,020,083 $ 953,431 $ 137,416 $ 147,497 $ 9,243 $ 6,041 Software 295,730 259,602 186,839 168,603 19,569 13,099 Services 199,349 158,426 31,453 29,080 12,865 11,947 $ 1,515,162 $ 1,371,459 $ 355,708 $ 345,180 $ 41,677 $ 31,087 North America EMEA APAC Nine Months Ended September 30, Nine Months Ended September 30, Nine Months Ended September 30, Sales Mix 2019 2018 2019 2018 2019 2018 Hardware $ 2,704,212 $ 2,724,916 $ 451,892 $ 505,844 $ 25,740 $ 22,518 Software 907,683 828,231 560,073 551,920 80,287 91,459 Services 551,215 465,458 113,092 104,086 39,840 36,658 $ 4,163,110 $ 4,018,605 $ 1,125,057 $ 1,161,850 $ 145,867 $ 150,635 All significant intercompany transactions are eliminated upon consolidation, and there are no differences between the accounting policies used to measure profit and loss for our segments or on a consolidated basis. Net sales are defined as net sales to external clients. None of our clients exceeded ten percent of consolidated net sales for the three or nine months ended September 30, 2019 or 2018. A portion of our operating segments selling and administrative expenses arise from shared services and infrastructure that we have historically provided to them in order to realize economies of scale and to use resources efficiently. These expenses, collectively identified as corporate charges, include senior management expenses, internal audit, legal, tax, insurance services, treasury and other corporate infrastructure expenses. Charges are allocated to our operating segments, and the allocations have been determined on a basis that we consider to be a reasonable reflection of the utilization of services provided to or benefits received by the operating segments. The following tables present our results of operations by reportable operating segment for the periods indicated (in thousands): Three Months Ended September 30, 2019 North America EMEA APAC Consolidated Net sales: Products $ 1,315,813 $ 324,255 $ 28,812 $ 1,668,880 Services 199,349 31,453 12,865 243,667 Total net sales 1,515,162 355,708 41,677 1,912,547 Costs of goods sold: Products 1,195,020 297,789 26,431 1,519,240 Services 101,498 10,028 5,586 117,112 Total costs of goods sold 1,296,518 307,817 32,017 1,636,352 Gross profit 218,644 47,891 9,660 276,195 Operating expenses: Selling and administrative expenses 170,993 44,568 7,654 223,215 Severance and restructuring expenses 2,449 213  2,662 Acquisition-related expenses 5,896   5,896 Earnings from operations $ 39,306 $ 3,110 $ 2,006 $ 44,422 Three Months Ended September 30, 2018 North America EMEA APAC Consolidated Net sales: Products $ 1,213,033 $ 316,100 $ 19,140 $ 1,548,273 Services 158,426 29,080 11,947 199,453 Total net sales 1,371,459 345,180 31,087 1,747,726 Costs of goods sold: Products 1,108,658 290,071 17,079 1,415,808 Services 83,474 7,875 5,655 97,004 Total costs of goods sold 1,192,132 297,946 22,734 1,512,812 Gross profit 179,327 47,234 8,353 234,914 Operating expenses: Selling and administrative expenses 134,792 42,206 7,097 184,095 Severance and restructuring expenses 253 430  683 Acquisition-related expenses 188   188 Earnings from operations $ 44,094 $ 4,598 $ 1,256 $ 49,948 Nine Months Ended September 30, 2019 North America EMEA APAC Consolidated Net sales: Products $ 3,611,895 $ 1,011,965 $ 106,027 $ 4,729,887 Services 551,215 113,092 39,840 704,147 Total net sales 4,163,110 1,125,057 145,867 5,434,034 Costs of goods sold: Products 3,290,555 926,712 98,197 4,315,464 Services 272,245 29,021 17,188 318,454 Total costs of goods sold 3,562,800 955,733 115,385 4,633,918 Gross profit 600,310 169,324 30,482 800,116 Operating expenses: Selling and administrative expenses 452,441 139,365 21,961 613,767 Severance and restructuring expenses 3,260 328 124 3,712 Acquisition-related expenses 9,059   9,059 Earnings from operations $ 135,550 $ 29,631 $ 8,397 $ 173,578 Nine Months Ended September 30, 2018 North America EMEA APAC Consolidated Net sales: Products $ 3,553,147 $ 1,057,764 $ 113,977 $ 4,724,888 Services 465,458 104,086 36,658 606,202 Total net sales 4,018,605 1,161,850 150,635 5,331,090 Costs of goods sold: Products 3,242,903 971,232 105,046 4,319,181 Services 230,487 25,370 16,498 272,355 Total costs of goods sold 3,473,390 996,602 121,544 4,591,536 Gross profit 545,215 165,248 29,091 739,554 Operating expenses: Selling and administrative expenses 402,638 137,383 21,718 561,739 Severance and restructuring expenses 1,034 1,545 130 2,709 Acquisition-related expenses 282   282 Earnings from operations $ 141,261 $ 26,320 $ 7,243 $ 174,824 The following is a summary of our total assets by reportable operating segment (in thousands): September 30, 2019 December 31, 2018 North America $ 3,729,338 $ 2,660,886 EMEA 596,657 611,338 APAC 101,829 98,959 Corporate assets and intercompany eliminations, net (445,464 ) (595,236 ) Total assets $ 3,982,360 $ 2,775,947 We recorded the following pre-tax amounts, by reportable operating segment, for depreciation and amortization in the accompanying consolidated financial statements (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Depreciation and amortization of property and equipment: North America $ 4,371 $ 4,131 $ 12,114 $ 12,587 EMEA 1,013 1,052 2,980 3,053 APAC 140 123 412 378 5,524 5,306 15,506 16,018 Amortization of intangible assets: North America 5,765 3,949 13,037 10,670 EMEA 67 71 205 216 APAC 114 165 348 513 5,946 4,185 13,590 11,399 Total $ 11,470 $ 9,491 $ 29,096 $ 27,417