Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 922	$ 17,434
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on investment in Venezuela	0	1,177
Depreciation and amortization	22,893	11,760
Amortization of deferred loan costs	242	112
Provision for doubtful accounts	2,496	389
Foreign currency (gain) loss	(99)	323
Deferred income taxes	(934)	(5)
Loss on asset disposal	47	503
Loss on revaluation of contingent consideration	2,184	0
Non-cash compensation cost	4,704	2,424
Other, net	(525)	0
(Increase) decrease, net of the effect of acquisitions:
Receivables	2,602	(22,331)
Inventory	156	(502)
Prepaid expenses and other current assets	(3,866)	(3,579)
Increase (decrease), net of the effect of acquisitions:
Accounts payable	14,379	408
Other accrued liabilities	(3,900)	16,510
Income taxes	(3,238)	(2,967)
Net cash provided by operating activities	38,063	21,656
Cash flows from investing activities:
Capital expenditures	(21,853)	(18,416)
Business acquisitions, net of cash acquired	(48,382)	(10,540)
Change in restricted cash	5,000
Proceeds from sale of assets	1,026	97
Decrease in other assets, net	213	120
Change related to Venezuelan operations	0	(621)
Net cash used in investing activities	(63,996)	(29,360)
Cash flows from financing activities:
Net borrowings under revolving credit agreement	53,191	14,070
Purchase of treasury stock	(7,593)	(21,138)
Debt issuance costs	(377)	0
Corporate tax effect from share-based payment arrangements	86	1,535
Issuance of common stock from share-based payment arrangements	1,064	2,550
Payments related to withholding tax for share-based payment arrangements	(154)	(41)
Net cash provided by (used in) financing activities	46,217	(3,024)
Effect of exchange rate changes on cash	331	(1,821)
Net increase (decrease) in cash and cash equivalents	20,615	(12,549)
Cash and cash equivalents at beginning of period	44,825	44,426
Cash and cash equivalents at end of period	$ 65,440	$ 31,877