CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net (loss) income	$ (1,053)	$ 3,929
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	7,970	7,131
Amortization of intangible assets	11,916	11,265
Amortization of debt issuance costs and debt discount	2,624	2,399
Inventory fair value purchase accounting adjustment	407	71
Provision for doubtful accounts	551	135
Stock-based compensation	271	1,553
Unrealized gain on derivative instruments, net	(74)	(13,219)
Loss on disposal of property and equipment	13	152
Deferred income taxes	(1,614)	2,543
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(31,221)	(11,273)
Other receivables	6,278	12,595
Inventories	(6,129)	(2,137)
Prepaid expenses and other current assets	1,423	787
Other assets	36	158
Accounts payable	2,423	8,249
Accrued payroll and employee benefits	(202)	(7,793)
Accrued taxes	3,301	(238)
Other liabilities	(13,461)	(15,424)
Net cash (used in) provided by operating activities	(16,541)	883
Cash flows from investing activities:
Purchases of property and equipment	(7,594)	(7,572)
Payment of net working capital adjustments	(15)	0
Proceeds from net working capital adjustments	178	0
Proceeds from the disposal of fixed assets	200	98
Acquisitions, net of cash acquired	(21,233)	(13,195)
Net cash used in investing activities	(28,464)	(20,669)
Cash flows from financing activities:
Proceeds from asset-based revolving credit facility	131,224	114,500
Repayments of asset-based revolving credit facility	(88,724)	(281,032)
Tax withholding payment related to net settlement of equity awards	(45)	0
Principal repayment of capital lease obligations	(745)	(691)
Issuance of common stock	0	164,189
Capital contributions	0	2,997
Net cash provided by (used in) financing activities	41,710	(37)
Effect of exchange rate changes on cash	(161)	64
Net decrease in cash	(3,456)	(19,759)
Cash and cash equivalents at beginning of period	12,101	28,552
Cash and cash equivalents at end of period	8,645	8,793
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	0	39
Cash paid during the period for interest	24,201	25,308
Supplemental disclosures of non-cash investing and financing activities:
Change in fair value of derivatives, net of tax	1,163	461
Assets acquired under capital lease	0	378
Goodwill adjustment for purchase price allocation	202	723
Tax receivable agreement	$ 0	$ 203,837