CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 378,478	$ 358,238
Direct costs	232,082	230,616
Operating costs and expenses:
Indirect and selling expenses	109,982	103,271
Depreciation and amortization	5,270	5,179
Amortization of intangible assets	3,015	2,853
Total operating costs and expenses	118,267	111,303
Operating income	28,129	16,319
Interest expense	(2,683)	(3,525)
Other (expense) income	(417)	190
Income before income taxes	25,029	12,984
Provision for income taxes	6,678	2,372
Net income	$ 18,351	$ 10,612
Earnings per Share:
Basic	$ 0.97	$ 0.56
Diluted	$ 0.96	$ 0.55
Weighted-average Shares:
Basic	18,885	18,840
Diluted	19,118	19,197
Cash dividends declared per common share	$ 0.14	$ 0.14
Other comprehensive income (loss), net of tax	$ 2,780	$ (11,123)
Comprehensive income (loss), net of tax	$ 21,131	$ (511)