Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities
Net income	$ 64,243	$ 71,132	$ 54,959
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	248	10,912	4,062
Deferred income taxes	7,428	8,816	(1,865)
Non-cash equity compensation	13,171	13,230	17,555
Depreciation and amortization	49,917	31,970	33,748
Facilities consolidation reserve	(317)	(302)	(288)
Amortization of debt issuance costs	1,305	617	710
Impairment of long-lived assets	8,412	7,901	3,090
Other adjustments, net	1,283	1,099	964
Changes in operating assets and liabilities, net of the effect of acquisitions:
Net contract assets and liabilities	(41,634)	3,069	6,064
Contract receivables	19,732	(19,021)	54,384
Prepaid expenses and other assets	(20,737)	4,529	(5,410)
Operating lease assets and liabilities, net	(1,466)	(5,481)	(2,307)
Accounts payable	30,003	13,479	(51,177)
Accrued salaries and benefits	(3,337)	(5,616)	26,810
Accrued subcontractors and other direct costs	6,965	(38,575)	32,544
Accrued expenses and other current liabilities	24,742	26,697	(18,198)
Income tax receivable and payable	(1,526)	(12,802)	5,375
Other liabilities	3,774	(1,449)	12,125
Net Cash Provided by Operating Activities	162,206	110,205	173,145
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(24,475)	(19,932)	(17,683)
Payments for business acquisitions, net of cash acquired	(237,280)	(174,549)	(253,265)
Proceeds from working capital adjustments related to prior business acquisition	2,911
Net Cash Used in Investing Activities	(258,844)	(194,481)	(270,948)
Cash Flows from Financing Activities
Advances from working capital facilities	1,583,936	881,037	1,020,451
Payments on working capital facilities	(1,446,125)	(773,264)	(870,114)
Payments on capital expenditure obligations			(1,712)
Receipt of restricted contract funds	15,721	264,214	65,694
Payment of restricted contract funds	(25,959)	(319,990)	(106)
Debt issuence costs	(4,907)		(2,094)
Proceeds from exercise of options	602	2,848	37
Dividends paid	(10,547)	(10,565)	(10,551)
Net payments for stockholder issuances and buybacks	(21,218)	(20,040)	(29,726)
Payments on business acquisition liabilities	(1,132)	(1,007)	(1,924)
Net Cash Provided by Financing Activities	90,371	23,233	169,955
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	(1,198)	(511)	3,353
(Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash	(7,465)	(61,554)	75,505
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	20,433	81,987	6,482
Cash, Cash Equivalents, and Restricted Cash, End of Period	12,968	20,433	81,987
Supplemental disclosure of cash flow information:
Interest	22,782	10,331	14,337
Income taxes	16,476	34,132	15,954
Non-cash investing and financing transactions:
Share repurchases transacted but not settled and paid		$ 552
Tenant improvements funded by lessor	20,253		3,124
Acquisition of property and equipment through finance lease	$ 18,319
Exercise of options receivable from shareholders			$ 2,615