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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Revenue | $ 197,015 | $ 185,042 | $ 421,253 | $ 398,908
Operating expenses | 173,996 | 163,117 | 352,113 | 333,981
Gross margin | 23,019 | 21,925 | 69,140 | 64,927
Corporate general and administrative expenses | 8,346 | 6,615 | 18,591 | 16,480
Operating income | 14,673 | 15,310 | 50,549 | 48,447
Other (expense) income: |  |  |  |
Interest expense | (1,733) | (2,848) | (3,259) | (5,825)
Gain on sale of operations, net | 50 | 45 | 151 | 101
Other income (expense), net | 703 | (1,126) | 2,850 | 1,733
Total other expense, net | (980) | (3,929) | (258) | (3,991)
Income from continuing operations before income tax expense | 13,693 | 11,381 | 50,291 | 44,456
Income tax expense | 5,306 | 4,696 | 20,106 | 18,268
Income from continuing operations | 8,387 | 6,685 | 30,185 | 26,188
Loss from discontinued operations, net of tax | (258) | (330) | (288) | (665)
Gain on disposal of discontinued operations, net of tax |  | 290 |  | 290
Net income | $ 8,129 | $ 6,645 | $ 29,897 | $ 25,813
Basic: |  |  |  |
Continuing operations | $ 0.16 | $ 0.14 | $ 0.58 | $ 0.54
Discontinued operations |  | (0.01) | (0.01) | (0.01)
Net income | 0.16 | 0.13 | 0.57 | 0.53
Diluted: |  |  |  |
Continuing operations | 0.16 | 0.13 | 0.57 | 0.51
Discontinued operations |  |  | (0.01) | (0.01)
Net income | $ 0.16 | $ 0.13 | $ 0.56 | $ 0.50
Basic weighted average shares outstanding | 52,031 | 49,464 | 51,802 | 48,809
Diluted weighted average shares outstanding | 53,079 | 52,024 | 52,901 | 51,227
Comprehensive Income: |  |  |  |
Net income | $ 8,129 | $ 6,645 | $ 29,897 | $ 25,813
Other comprehensive (loss) income, net of tax | (130) | (92) | (441) | 46
Comprehensive income | $ 7,999 | $ 6,553 | $ 29,456 | $ 25,859

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