CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 111,598	$ 43,733
Reconciliation of net income to net cash provided by operating activities
Depreciation and amortization	21,829	16,976
Debt discount and deferred loan cost amortization	229	1,314
Stock-based compensation	3,384
Inventory obsolescence	932	618
Loss on disposal of assets	1,759	115
Deferred income taxes	11,762	167
Loss on debt extinguishment	4,305
Changes in operating assets and liabilities:
Accounts receivable	(21,761)	(40,647)
Inventories	(22,866)	(25,630)
Prepaid expenses and other assets	(3,835)	(4,380)
Accounts payable	8,108	20,834
Accrued expenses and other liabilities	6,906	6,410
Net cash provided by operating activities	122,350	19,510
Cash flows from investing activities
Capital expenditures	(55,720)	(22,327)
Patent expenditures		(8)
Proceeds from sale of assets	1,313	908
Net cash used in investing activities	(54,407)	(21,427)
Cash flows from financing activities
Principal payments on long-term debt	(248,529)	(1,927)
Payment of deferred financing costs	(576)
Payments on capital leases	(4,456)	(1,682)
Net proceeds from IPO and Follow-on Offering	828,168
Distributions to members	(31,848)
Redemption of CW Units	(575,681)
Net cash used in financing activities	(32,922)	(3,609)
Effect of exchange rate changes on cash and cash equivalents	(614)	62
Net increase (decrease) in cash and cash equivalents	34,407	(5,464)
Cash and cash equivalents
Beginning of period	7,574	8,688
End of period	$ 41,981	$ 3,224