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Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Revenue | $ 922,003 | $ 855,340 | $ 799,832
Operating expenses | 790,283 | 755,584 | 697,726
Gross margin | 131,720 | 99,756 | 102,106
Corporate general and administrative expenses | 39,173 | 33,295 | 36,319
Operating income (loss) | 92,547 | 66,461 | 65,787
Other (expense) income: |  |  |
Interest expense | (6,645) | (6,675) | (6,593)
Gain on sale of operations, net | 1,025 | 45 | 855
Other (expense) income, net | (7,087) | 14,489 | 6,957
Total other (expense) income, net | (12,707) | 7,859 | 1,219
Income from continuing operations before income tax expense | 79,840 | 74,320 | 67,006
Income tax expense | 18,267 | 23,288 | 26,399
Income (loss) from continuing operations | 61,573 | 51,032 | 40,607
Loss from operations of discontinued operations, net of tax | (3) | (655) | (542)
Net income (loss) | $ 61,570 | $ 50,377 | $ 40,065
Basic: |  |  |
Continuing operations | $ 1.13 | $ 0.95 | $ 0.78
Discontinued operations |  | (0.01) | (0.01)
Net income | 1.13 | 0.94 | 0.77
Diluted: |  |  |
Continuing operations | 1.09 | 0.92 | 0.76
Discontinued operations |  | (0.01) | (0.01)
Net income | $ 1.09 | $ 0.91 | $ 0.75
Basic weighted average common shares outstanding | 54,561 | 53,862 | 52,321
Diluted weighted average common shares outstanding | 56,487 | 55,689 | 53,513
Comprehensive income: |  |  |
Net income | $ 61,570 | $ 50,377 | $ 40,065
Other comprehensive income: |  |  |
Net unrealized loss on available-for-sale securities, net of income tax benefit of $96, $16 and $77 | (259) | (42) | (23)
Net unrealized (loss) gain on interest rate swaps, net of income tax (benefit) expense of ($8), $107 and $135 | (17) | 379 | 182
Foreign currency translation | (24) | (15) | (30)
Total other comprehensive (loss) income | (300) | 322 | 129
Total comprehensive income | $ 61,270 | $ 50,699 | $ 40,194

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