Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income (loss)	$ 16,430	$ 3,949	$ (32,389)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	13,390	17,916	17,472
Stock-based compensation expense	6,820	5,572	5,873
Deferred income taxes	4,072	4,226	5,879
Change in fair value of contingent consideration liability	677	10,417	(270)
Goodwill impairment charge	0	0	37,539
Intangible asset impairment charges	0	70	202
Bad debt provision	454	2,171	1,685
Secured asset reserve	0	0	2,023
Venezuela remeasurement charges	0	0	890
Excess tax benefit from exercise of stock awards	0	(4,030)	0
Other operating activities	210	210	210
Change in assets, net of acquisitions:
Accounts receivable and unbilled revenue	(41,877)	(2,651)	(10,580)
Inventories	(4,245)	6,355	(9,676)
Prepaid expenses and other assets	(13,547)	(8,206)	(4,140)
Change in liabilities, net of acquisitions:
Accounts payable	18,152	(38,408)	25,102
Accrued expenses and other liabilities	15,520	12,933	3,582
Net cash provided by operating activities	16,056	10,525	43,402
Cash flows from investing activities
Purchases of property and equipment	(12,483)	(13,319)	(15,034)
Net cash used in investing activities	(12,483)	(13,319)	(15,034)
Cash flows from financing activities
Net borrowing (repayments) of revolving credit facility	(867)	8,739	(5,281)
Net short-term secured borrowings (repayments)	20,709	405	(799)
Repurchases of common stock	(10,885)	0	(4,897)
Payments of contingent consideration	(15,345)	(11,374)	(8,010)
Proceeds from exercise of stock options	2,663	2,636	1,195
Excess tax benefit from exercise of stock awards	0	4,030	0
Other financing activities	(1,156)	(866)	(594)
Net cash (used in) provided by financing activities	(4,881)	3,570	(18,386)
Effect of exchange rate changes on cash and cash equivalents	948	(607)	(1,805)
(Decrease) increase in cash and cash equivalents	(362)	169	8,177
Cash and cash equivalents, beginning of period	30,924	30,755	22,578
Cash and cash equivalents, end of period	$ 30,562	$ 30,924	$ 30,755