Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net income	$ 68,938	$ 61,400	$ 62,876
Adjustments to reconcile net income to net cash provided by operating activities:
Bad debt expense	624	2,480	1,480
Deferred income taxes	(123)	5,100	(7,390)
Non-cash equity compensation	15,818	11,506	10,291
Depreciation and amortization	28,182	27,206	28,579
Deferred rent	(1,247)	523	(177)
Facilities consolidation reserve	(274)	(260)	1,479
Remeasurement of contingent acquisition liability		505
Amortization of debt issuance costs	507	510	673
Impairment of long-lived assets	1,728
Other adjustments, net	181	449	275
Changes in operating assets and liabilities, net of the effect of acquisitions:
Net contract assets and liabilities	(11,963)	(14,148)	405
Contract receivables	(31,300)	(60,096)	702
Prepaid expenses and other assets	1,997	(6,650)	(1,844)
Accounts payable	31,949	28,309	3,631
Accrued salaries and benefits	8,012	(2,159)	5,597
Accrued subcontractors and other direct costs	(12,293)	10,762	15,507
Accrued expenses and other current liabilities	(4,951)	11,120	(2,250)
Income tax receivable and payable	(4,489)	(2,063)	(5,697)
Other liabilities	144	176	3,054
Net Cash Provided by Operating Activities	91,440	74,670	117,191
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(26,901)	(21,812)	(14,513)
Payments for business acquisitions, net of cash received	(3,569)	(34,575)	(91)
Net Cash Used in Investing Activities	(30,470)	(56,387)	(14,604)
Cash Flows from Financing Activities
Advances from working capital facilities	686,830	573,991	590,225
Payments on working capital facilities	(721,809)	(579,817)	(643,363)
Payments on capital expenditure obligations	(1,621)	(3,726)	(4,808)
Debt issue costs		(21)	(1,612)
Proceeds from exercise of options	2,914	5,842	4,722
Dividends paid	(10,540)	(7,915)
Net payments for stockholder issuances and buybacks	(23,414)	(17,125)	(32,464)
Net Cash Used in Financing Activities	(67,640)	(28,771)	(87,300)
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	166	(792)	1,094
(Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash	(6,504)	(11,280)	16,381
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	12,986	24,266	7,885
Cash, Cash Equivalents, and Restricted Cash, End of Period	6,482	12,986	24,266
Supplemental disclosure of cash flow information:
Interest	10,424	9,893	7,922
Income taxes	$ 26,595	14,870	$ 21,659
Non-cash investing and financing transactions:
Deferred and contingent consideration arising from businesses acquired		8,391
Capital expenditure obligations		$ 6,121