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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