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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Revenue | $ 239,790 | $ 224,249 | $ 745,286 | $ 722,980
Operating expenses | 209,146 | 198,607 | 622,790 | 608,459
Gross margin | 30,644 | 25,642 | 122,496 | 114,521
Corporate general and administrative expenses | 11,670 | 10,279 | 33,916 | 30,300
Operating income | 18,974 | 15,363 | 88,580 | 84,221
Other income (expense): |  |  |  |
Interest expense | (1,521) | (1,614) | (4,509) | (5,211)
(Loss) gain on sale of operations, net | (145) |  | 402 | 663
Other income, net | 6,767 | 3,143 | 12,716 | 2,544
Total other income (expense), net | 5,101 | 1,529 | 8,609 | (2,004)
Income from continuing operations before income tax expense | 24,075 | 16,892 | 97,189 | 82,217
Income tax expense | 6,069 | 3,297 | 25,004 | 19,691
Income from continuing operations | 18,006 | 13,595 | 72,185 | 62,526
(Loss) gain from discontinued operations, net of tax | (200) | (9) | (318) | 17
Net income | $ 17,806 | $ 13,586 | $ 71,867 | $ 62,543
Basic: |  |  |  |
Continuing operations | $ 0.33 | $ 0.25 | $ 1.33 | $ 1.15
Discontinued operations |  |  | (0.01) |
Net income | 0.33 | 0.25 | 1.32 | 1.15
Diluted: |  |  |  |
Continuing operations | 0.32 | 0.24 | 1.29 | 1.11
Discontinued operations |  |  | (0.01) |
Net income | $ 0.32 | $ 0.24 | $ 1.28 | $ 1.11
Basic weighted average shares outstanding | 54,268 | 54,794 | 54,215 | 54,489
Diluted weighted average shares outstanding | 55,816 | 56,740 | 55,778 | 56,393
Comprehensive income: |  |  |  |
Net income | $ 17,806 | $ 13,586 | $ 71,867 | $ 62,543
Other comprehensive income, net of tax | (129) | 55 | (470) | 343
Comprehensive income | $ 17,677 | $ 13,641 | $ 71,397 | $ 62,886

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