CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 392,525	$ 353,987	$ 771,003	$ 712,225
Direct costs	246,646	223,407	478,728	454,023
Operating costs and expenses:
Indirect and selling expenses	106,178	99,255	216,160	202,526
Depreciation and amortization	4,728	5,064	9,998	10,243
Amortization of intangible assets	3,019	3,479	6,034	6,332
Total operating costs and expenses	113,925	107,798	232,192	219,101
Operating income	31,954	22,782	60,083	39,101
Interest expense	(2,612)	(3,908)	(5,295)	(7,433)
Other (expense) income	(46)	349	(463)	539
Income before income taxes	29,296	19,223	54,325	32,207
Provision for income taxes	8,984	5,567	15,662	7,939
Net income	$ 20,312	$ 13,656	$ 38,663	$ 24,268
Earnings per Share:
Basic	$ 1.08	$ 0.73	$ 2.05	$ 1.29
Diluted	$ 1.07	$ 0.72	$ 2.03	$ 1.27
Weighted-average Shares:
Basic	18,843	18,829	18,864	18,835
Diluted	19,022	19,020	19,078	19,120
Cash dividends declared per common share	$ 0.14	$ 0.14	$ 0.28	$ 0.28
Other comprehensive income (loss), net of tax	$ 432	$ (164)	$ 3,212	$ (11,287)
Comprehensive income, net of tax	$ 20,744	$ 13,492	$ 41,875	$ 12,981