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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