CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 4,347	$ 5,189
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	16,329	14,723
Amortization of intangible assets	23,898	22,700
Amortization of debt issuance costs and debt discount	5,298	4,844
Inventory fair value purchase accounting adjustment	407	664
Provision for doubtful accounts	1,050	766
Stock-based compensation	927	1,765
Unrealized gain on derivative instruments, net	(135)	(13,155)
Loss on disposal of property and equipment	309	242
Deferred income taxes	(421)	3,356
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(63,199)	(32,706)
Other receivables	9,918	10,638
Inventories	(25,680)	(2,807)
Prepaid expenses and other current assets	(1,155)	561
Other assets	382	393
Accounts payable	11,349	17,875
Accrued payroll and employee benefits	3,674	(4,433)
Accrued taxes	3,855	(1,474)
Other liabilities	(491)	(7,258)
Net cash (used in) provided by operating activities	(9,338)	21,883
Cash flows from investing activities:
Purchases of property and equipment	(20,463)	(17,525)
Payment of net working capital adjustments	(40)	(405)
Proceeds from net working capital adjustments	336	8,554
Proceeds from the disposal of fixed assets	577	429
Acquisitions, net of cash acquired	(21,220)	(52,951)
Net cash used in investing activities	(40,810)	(61,898)
Cash flows from financing activities:
Proceeds from asset-based revolving credit facility	266,198	280,995
Repayments of asset-based revolving credit facility	(219,350)	(415,497)
Tax withholding payment related to net settlement of equity awards	(45)	0
Principal repayment of capital lease obligations	(1,489)	(1,395)
Issuance of common stock	0	163,952
Capital contributions	0	2,997
Net cash provided by financing activities	45,314	31,052
Effect of exchange rate changes on cash	(184)	357
Net decrease in cash	(5,018)	(8,606)
Cash and cash equivalents at beginning of period	12,101	28,552
Cash and cash equivalents at end of period	7,083	19,946
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	1,423	143
Cash paid during the period for interest	25,226	25,699
Supplemental disclosures of non-cash investing and financing activities:
Change in fair value of derivative, net of tax	2,259	1,400
Assets acquired under capital lease	0	658
Goodwill adjustment for purchase price allocation	202	1,724
Tax receivable agreement	0	203,837
Property and equipment included in accounts payable	$ 0	$ 198