CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 6,588	$ (19,566)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	22,675	9,620
Amortization of intangible assets	34,477	23,985
Amortization of debt issuance costs and debt discount	7,352	3,599
Inventory fair value purchase accounting adjustment	942	6,372
Unrealized gain on foreign currency, net	(169)	(17)
Loss on extinguishment of debt	0	5,355
Provision for doubtful accounts	2,182	1,923
Stock-based compensation	1,978	0
Unrealized gain on derivative instruments, net	(13,045)	(148)
Loss on disposal of property and equipment	202	243
Deferred income taxes	2,710	(5,160)
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(29,837)	(21,179)
Other receivables	6,429	2,177
Inventories	20	(6,782)
Prepaid expenses and other current assets	(945)	(696)
Other assets	(2,180)	(110)
Accounts payable	18,414	(2,949)
Accrued payroll and employee benefits	(4,797)	2,647
Accrued taxes	(521)	1,187
Other liabilities	(19,920)	7,421
Net cash provided by operating activities	32,555	7,922
Cash flows from investing activities:
Purchases of property and equipment	(26,268)	(22,780)
Payment of net working capital adjustments	(405)	0
Proceeds from net working capital adjustments	8,590	0
Proceeds from the disposal of fixed assets	528	0
Acquisitions, net of cash acquired	(73,348)	(372,116)
Net cash used in investing activities	(90,903)	(394,896)
Cash flows from financing activities:
Proceeds from asset-based revolving credit facility	395,688	215,000
Repayments of asset-based revolving credit facility	(524,782)	(95,000)
Principal borrowings on long-term debt	0	713,600
Principal payments on long-term debt	0	(463,606)
Debt issuance costs	0	(34,359)
Principal repayment of capital lease obligations	(2,110)	(2,000)
Issuance of common stock	163,952	0
Capital contributions	2,997	66,205
Capital distributions	0	(67)
Net cash provided by financing activities	35,745	399,773
Effect of exchange rate changes on cash	363	(68)
Net (decrease) increase in cash	(22,240)	12,731
Cash and cash equivalents at beginning of period	28,552	10,662
Cash and cash equivalents at end of period	6,312	23,393
Supplemental disclosures of cash flow information:
Cash paid for income taxes	3,236	2,228
Cash paid for interest	49,937	18,717
Cash paid during the period for early debt repayment penalty	0	1,600
Supplemental disclosures of non-cash investing and financing activities:
Change in fair value of derivatives, net of tax	3,047	722
Assets acquired under capital lease	667	804
Goodwill adjustment for purchase price allocation	518	0
Tax receivable agreement	203,837	0
Property and equipment included in accounts payable	0	133
Embedded derivative in issued notes	$ 0	$ 6,200