CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Oct. 08, 2015	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (7,926)	$ (29,455)	$ 82,480	$ (28,370)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	1,973		30,582	16,487
Amortization of intangible assets	5,197	7,800	46,268	34,891
Amortization of debt issuance costs and debt discount	787		9,910	5,950
Inventory fair value purchase accounting adjustment	7,453		814	6,469
Loss on extinguishment of debt	0		0	5,354
Provision for doubtful accounts	483		2,095	1,608
Stock-based compensation	0		2,199	0
Reduction in tax receivable agreement liability	0	0	(68,033)	0
Unrealized (gain) loss on derivative instruments, net	0		(13,059)	6,952
Loss (gain) on disposal of property and equipment	(30)		276	1,791
Paid-in-kind interest	0		0	0
Deferred income taxes	6,521		(6,081)	(17,669)
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	11,436		1,115	5,985
Other receivables	(5,973)		(4,078)	(13,220)
Inventories	89		(16,359)	(9,727)
Prepaid expenses and other current assets	942		260	(3,588)
Other assets	10,110		2,980	(800)
Accounts payable	(13,088)		25,975	(21,622)
Accrued payroll and employee benefits	1,753		(6,015)	3,931
Accrued taxes	(1,399)		(1,385)	3,392
Other liabilities	(718)		(12,683)	35,316
Net cash provided by operating activities	17,610		77,261	33,130
Cash flows from investing activities:
Purchases of property and equipment	(2,760)		(29,760)	(30,473)
Payment of net working capital adjustments related to acquisitions	0		(405)	0
Proceeds from net working capital adjustments related to acquisitions	0		8,602	0
Proceeds from the disposal of fixed assets	0		2,586	587
Acquisitions, net of cash acquired	(657,563)		(77,961)	(401,919)
Net cash used in investing activities	(660,323)		(96,938)	(431,805)
Cash flows from financing activities:
Proceeds from asset-based revolving credit facility	80,000	205,915	400,239	456,469
Repayments of asset-based revolving credit facility	(10,000)	(199,299)	(561,509)	(318,000)
Principal borrowings on long-term debt	307,950	80,000	0	645,000
Principal payments on long-term debt	0	0	0	(397,369)
Debt issuance costs	(8,172)	(1,165)	0	(34,406)
Principal repayment of capital lease obligations	0	0	2,837	1,175
Issuance of common stock	0	0	163,952	0
Capital contributions	272,904	1,116	2,997	66,205
Capital distributions	0	0	0	(67)
Net cash provided by financing activities	642,682	86,567	2,842	416,657
Effect of exchange rate changes on cash	0	0	384	(92)
Net (decrease) increase in cash	(31)	8,477	(16,451)	17,890
Cash and cash equivalents at beginning of period	10,662	10,693	12,101	28,552
Cash and cash equivalents at end of period	10,693		28,552	10,662
Supplemental disclosures of cash flow information:
Cash paid for income taxes	1	257	4,129	4,448
Cash paid for interest	6,695	15,649	50,866	19,745
Cash paid during the period for early debt repayment penalty	0	0	0	1,600
Supplemental disclosures of non-cash investing and financing activities:
Change in fair value of derivatives, net of tax	0	0	2,970	1,461
Assets acquired under capital lease	0	0	670	3,196
Goodwill adjustment for purchase price allocation	0	0	519	1,210
Tax receivable agreement	0	0	203,837	0
Embedded derivative in issued notes	0	0	0	6,200
Notes received for disposals of equipment	$ 0	0	$ 134	$ 0
Predecessor
Cash flows from operating activities:
Net income (loss)		(29,455)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation		7,808
Amortization of intangible assets		7,807
Amortization of debt issuance costs and debt discount		3,078
Inventory fair value purchase accounting adjustment		1,606
Loss on extinguishment of debt		0
Provision for doubtful accounts		1,511
Stock-based compensation		0
Unrealized (gain) loss on derivative instruments, net		0
Loss (gain) on disposal of property and equipment		281
Paid-in-kind interest		250
Deferred income taxes		(1,837)
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable		(24,859)
Other receivables		(2,806)
Inventories		4,862
Prepaid expenses and other current assets		(1,252)
Other assets		(1,019)
Accounts payable		21,437
Accrued payroll and employee benefits		9,342
Accrued taxes		4,019
Other liabilities		18,403
Net cash provided by operating activities		19,176
Cash flows from investing activities:
Purchases of property and equipment		(9,776)
Payment of net working capital adjustments related to acquisitions		0
Proceeds from net working capital adjustments related to acquisitions		0
Proceeds from the disposal of fixed assets		0
Acquisitions, net of cash acquired		(87,490)
Net cash used in investing activities		$ (97,266)