Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net income	$ 61,400	$ 62,876	$ 46,584
Adjustments to reconcile net income to net cash provided by operating activities:
Bad debt expense	2,480	1,480	1,089
Deferred income taxes	5,100	(7,390)	6,535
Non-cash equity compensation	11,506	10,291	9,082
Depreciation and amortization	27,206	28,579	29,119
Deferred rent	523	(177)	(43)
Proceeds from hedge sale			3,600
Facilities consolidation reserve	(260)	1,479
Remeasurement of contingent acquisition liability	505
Amortization of debt issuance costs	510	673	532
Other adjustments, net	449	275	(1,169)
Changes in operating assets and liabilities, net of the effect of acquisitions:
Net contract assets and liabilities	(14,148)	405	(20,025)
Contract receivables	(60,096)	702	(9,702)
Prepaid expenses and other assets	(6,650)	(1,844)	(2,792)
Accounts payable	28,309	3,631	8,941
Accrued salaries and benefits	(2,159)	5,597	1,140
Accrued subcontractors and other direct costs	10,762	15,507	4,522
Accrued expenses and other current liabilities	11,120	(2,250)	5,730
Income tax receivable and payable	(2,063)	(5,697)	(2,447)
Other liabilities	176	3,054	(639)
Net Cash Provided by Operating Activities	74,670	117,191	80,057
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(21,812)	(14,513)	(13,791)
Payments for business acquisitions, net of cash received	(34,575)	(91)	(100)
Net Cash Used in Investing Activities	(56,387)	(14,604)	(13,891)
Cash Flows from Financing Activities
Advances from working capital facilities	573,991	590,225	478,584
Payments on working capital facilities	(579,817)	(643,363)	(530,728)
Payments on capital expenditure obligations	(3,726)	(4,808)	(4,041)
Debt issue costs	(21)	(1,612)
Proceeds from exercise of options	5,842	4,722	3,034
Dividends paid	(7,915)
Net payments for stockholder issuances and buybacks	(17,125)	(32,464)	(13,823)
Net Cash Used in Financing Activities	(28,771)	(87,300)	(66,974)
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	(792)	1,094	(416)
(Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash	(11,280)	16,381	(1,224)
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	24,266	7,885	9,109
Cash, Cash Equivalents, and Restricted Cash, End of Period	12,986	24,266	7,885
Supplemental disclosure of cash flow information:
Interest	9,893	7,922	8,937
Income taxes	14,870	$ 21,659	$ 21,094
Non-cash investing and financing transactions:
Deferred and contingent consideration arising from businesses acquired	8,391
Capital expenditure obligations	$ 6,121