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 (loss)	$ 4,370	$ (33,063)	$ 43,736
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	17,916	17,472	17,723
Stock-based compensation expense	5,572	5,873	5,352
Deferred income taxes	4,084	6,947	(2,649)
Change in fair value of contingent consideration liability	10,417	(270)	(37,873)
Goodwill impairment charge	0	37,539	0
Intangible asset impairment charges	70	202	2,710
Bad debt provision	2,171	1,949	1,984
Secured asset reserve	0	2,023	940
Venezuela remeasurement charges	0	(890)	0
Excess tax benefit from exercise of stock awards	(4,030)	0	(185)
Other operating activities	210	210	364
Change in assets, net of acquisitions:
Accounts receivable and unbilled revenue	1,809	(10,361)	(14,793)
Inventories	1,690	(8,188)	(635)
Prepaid expenses and other assets	2,442	(6,138)	(7,335)
Change in liabilities, net of acquisitions:
Accounts payable	(48,955)	26,199	(25,199)
Accrued expenses and other liabilities	12,759	2,118	3,345
Net cash provided by (used in) operating activities	10,525	43,402	(12,515)
Cash flows from investing activities
Purchases of property and equipment	(13,319)	(15,034)	(14,116)
Other investing activities	0	0	(594)
Net cash used in investing activities	(13,319)	(15,034)	(14,710)
Cash flows from financing activities
Net borrowing (repayments) of revolving credit facility	8,739	(5,281)	35,539
Net short-term secured borrowings (repayments)	405	(799)	2,618
Repurchases of common stock	0	(4,897)	0
Payments of contingent consideration	(11,374)	(8,010)	(5,769)
Proceeds from exercise of stock options	2,636	1,195	778
Payment of debt issuance costs	0	0	(696)
Excess tax benefit from exercise of stock awards	4,030	0	185
Other financing activities	(866)	(594)	(399)
Net cash provided by (used) in financing activities	3,570	(18,386)	32,256
Effect of exchange rate changes on cash and cash equivalents	(607)	(1,805)	(1,059)
Increase in cash and cash equivalents	169	8,177	3,972
Cash and cash equivalents, beginning of period	30,755	22,578	18,606
Cash and cash equivalents, end of period	$ 30,924	$ 30,755	$ 22,578