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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