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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Revenue $ 855,340 $ 799,832 $ 750,422
Operating expenses 755,584 697,726 652,391 [1]
Gross margin 99,756 102,106 98,031
Corporate general and administrative expenses 33,295 36,319 32,527 [1]
Operating income (loss) 66,461 65,787 65,504
Other income (expense):      
Interest expense (6,675) (6,593) (8,902)
Gain on sale of operations, net 45 855 84
Other income, net 14,489 6,957 1,146 [1]
Total other income (expense), net 7,859 1,219 (7,672)
Income from continuing operations before income tax expense 74,320 67,006 57,832
Income tax expense 23,288 26,399 22,829
Income (loss) from continuing operations 51,032 40,607 35,003
Loss from operations of discontinued operations, net of tax (655) (542) (2,323)
Gain on disposal of discontinued operations, net of tax     1,427
Net income (loss) $ 50,377 $ 40,065 $ 34,107
Basic:      
Continuing operations $ 0.95 $ 0.78 $ 0.70
Discontinued operations (0.01) (0.01) (0.01)
Net income 0.94 0.77 0.69
Diluted:      
Continuing operations 0.92 0.76 0.66
Discontinued operations (0.01) (0.01) (0.01)
Net income $ 0.91 $ 0.75 $ 0.65
Basic weighted average common shares outstanding 53,862 52,321 50,280
Diluted weighted average common shares outstanding 55,689 53,513 52,693
Comprehensive income:      
Net income $ 50,377 $ 40,065 $ 34,107
Other comprehensive income:      
Net unrealized loss on available-for-sale securities, net of income tax benefit of $28, $16 and $77 (42) (23) (114)
Net unrealized gain on interest rate swaps, net of income tax expense of $223, $107 and $135 379 182 230
Foreign currency translation (15) (30) (54)
Total other comprehensive income 322 129 62
Total comprehensive income $ 50,699 $ 40,194 $ 34,169
[1] “Operating expenses” under the Financial Services and Benefits and Insurance Services practice groups include a reduction of $0.9 million and $0.6 million related to a state payroll tax incentive associated with an office relocation. “Corporate general and administrative expenses” include a reduction of less than $0.1 million related to the office relocation as discussed above. The reductions was recorded in “Other (expense) income, net” in 2015 but was reclassified to “Operating expenses” and “Corporate general and administrative expenses” to align the incentives with the expenses associated with the office relocation. The reclassification had no impact on “Income from continuing operations” or diluted earnings per share from continuing operations.