Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities
Net income	$ 71,132	$ 54,959	$ 68,938
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	10,912	4,062	624
Deferred income taxes	8,816	(1,865)	(123)
Non-cash equity compensation	13,230	17,555	15,818
Depreciation and amortization	31,970	33,748	28,182
Facilities consolidation reserve	(302)	(288)	(274)
Amortization of debt issuance costs	617	710	507
Impairment of long-lived assets	7,901	3,090	1,728
Other adjustments, net	1,099	964	181
Changes in operating assets and liabilities, net of the effect of acquisitions:
Net contract assets and liabilities	3,069	6,064	(11,963)
Contract receivables	(19,021)	54,384	(31,300)
Prepaid expenses and other assets	4,529	(5,410)	1,997
Operating lease assets and liabilities, net	(5,481)	(2,307)	(1,247)
Accounts payable	13,479	(51,177)	31,949
Accrued salaries and benefits	(5,616)	26,810	8,012
Accrued subcontractors and other direct costs	(38,575)	32,544	(12,293)
Accrued expenses and other current liabilities	26,697	(18,198)	(4,951)
Income tax receivable and payable	(12,802)	5,375	(4,489)
Other liabilities	(1,449)	12,125	144
Net Cash Provided by Operating Activities	110,205	173,145	91,440
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(19,932)	(17,683)	(26,901)
Payments for business acquisitions, net of cash acquired	(174,549)	(253,265)	(3,569)
Net Cash Used in Investing Activities	(194,481)	(270,948)	(30,470)
Cash Flows from Financing Activities
Advances from working capital facilities	881,037	1,020,451	686,830
Payments on working capital facilities	(773,264)	(870,114)	(721,809)
Payments on capital expenditure obligations		(1,712)	(1,621)
Receipt of restricted contract funds	264,214	65,694
Payment of restricted contract funds	(319,990)	(106)
Debt issue costs		(2,094)
Proceeds from exercise of options	2,848	37	2,914
Dividends paid	(10,565)	(10,551)	(10,540)
Net payments for stockholder issuances and buybacks	(20,040)	(29,726)	(23,414)
Payments on business acquisition liabilities	(1,007)	(1,924)
Net Cash Provided by (Used in) Financing Activities	23,233	169,955	(67,640)
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	(511)	3,353	166
(Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash	(61,554)	75,505	(6,504)
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	81,987	6,482	12,986
Cash, Cash Equivalents, and Restricted Cash, End of Period	20,433	81,987	6,482
Supplemental disclosure of cash flow information:
Interest	10,331	14,337	10,424
Income taxes	34,132	15,954	$ 26,595
Non-cash investing and financing transactions:
Share repurchases transacted but not settled and paid	$ 552
Tenant improvements funded by lessor		3,124
Exercise of options receivable from shareholders		$ 2,615