Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net income	$ 46,584	$ 39,369	$ 40,030
Adjustments to reconcile net income to net cash provided by operating activities:
Bad debt expense	1,089	268	272
Deferred income taxes	6,535	2,106	4,071
Non-cash equity compensation	9,082	10,850	11,008
Depreciation and amortization	29,119	33,406	23,806
Deferred rent	(43)	1,002	2,685
Proceeds from hedge sale	3,600
Other adjustments, net	(637)	1,786	(3,015)
Changes in operating assets and liabilities, net of the effect of acquisitions:
Contract receivables	(29,020)	(2,713)	(2,464)
Prepaid expenses and other assets	(2,792)	(170)	(1,743)
Accounts payable	8,941	(2,374)	9,424
Accrued salaries and benefits	1,140	(13,208)	4,286
Accrued expenses	10,252	(4,522)	683
Deferred revenue	(707)	2,367	(2,099)
Income tax receivable and payable	(2,447)	8,356	(6,453)
Restricted cash	(494)	116	387
Other liabilities	(639)	(320)	(1,718)
Net Cash Provided by Operating Activities	79,563	76,319	79,160
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(13,791)	(12,682)	(10,635)
Payments for business acquisitions, net of cash received	(100)	(1,818)	(347,871)
Net Cash Used in Investing Activities	(13,891)	(14,500)	(358,506)
Cash Flows from Financing Activities
Advances from working capital facilities	478,584	381,745	733,032
Payments on working capital facilities	(530,728)	(420,265)	(422,980)
Payments on capital expenditure obligations	(4,041)	(3,289)	(2,339)
Debt issue costs		(17)	(1,245)
Proceeds from exercise of options	3,034	932	1,831
Tax benefits of stock option exercises and award vesting		1,307	3,543
Net payments for stockholder issuances and buybacks	(13,823)	(24,861)	(28,323)
Net Cash (Used in) Provided by Financing Activities	(66,974)	(64,448)	283,519
Effect of Exchange Rate Changes on Cash	(403)	(1,746)	(1,004)
(Decrease) Increase in Cash and Cash Equivalents	(1,705)	(4,375)	3,169
Cash and cash equivalents, beginning of period	7,747	12,122	8,953
Cash and cash equivalents, end of period	6,042	7,747	12,122
Supplemental disclosure of cash flow information:
Interest	8,937	9,845	2,728
Income taxes	21,094	16,315	24,335
Non-cash investing and financing transactions:
Capital expenditure obligations		$ 12,870