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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Revenue | $ 211,016 | $ 197,015 | $ 452,475 | $ 421,253
Operating expenses | 188,120 | 173,996 | 380,886 | 352,113
Gross margin | 22,896 | 23,019 | 71,589 | 69,140
Corporate general and administrative expenses | 9,232 | 8,346 | 18,000 | 18,591
Operating income | 13,664 | 14,673 | 53,589 | 50,549
Other (expense) income: |  |  |  |
Interest expense | (1,692) | (1,733) | (3,209) | (3,259)
Gain on sale of operations, net | 23 | 50 | 45 | 151
Other income, net | 3,764 | 703 | 6,501 | 2,850
Total other income (expense), net | 2,095 | (980) | 3,337 | (258)
Income from continuing operations before income tax expense | 15,759 | 13,693 | 56,926 | 50,291
Income tax expense | 4,343 | 5,306 | 20,484 | 20,106
Income from continuing operations | 11,416 | 8,387 | 36,442 | 30,185
Loss from discontinued operations, net of tax | (418) | (258) | (570) | (288)
Net income | $ 10,998 | $ 8,129 | $ 35,872 | $ 29,897
Basic: |  |  |  |
Continuing operations | $ 0.21 | $ 0.16 | $ 0.68 | $ 0.58
Discontinued operations | (0.01) |  | (0.01) | (0.01)
Net income | 0.20 | 0.16 | 0.67 | 0.57
Diluted: |  |  |  |
Continuing operations | 0.20 | 0.16 | 0.66 | 0.57
Discontinued operations | (0.01) |  | (0.01) | (0.01)
Net income | $ 0.19 | $ 0.16 | $ 0.65 | $ 0.56
Basic weighted average shares outstanding | 53,968 | 52,031 | 53,632 | 51,802
Diluted weighted average shares outstanding | 55,831 | 53,079 | 55,530 | 52,901
Comprehensive Income: |  |  |  |
Net income | $ 10,998 | $ 8,129 | $ 35,872 | $ 29,897
Other comprehensive income (loss), net of tax | 37 | (130) | 217 | (441)
Comprehensive income | $ 11,035 | $ 7,999 | $ 36,089 | $ 29,456

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