CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 67,950	$ 21,432
Reconciliation of net income to net cash provided by operating activities
Depreciation and amortization	13,988	10,902
Debt discount and deferred loan cost amortization	219	876
Stock-based compensation	2,097
Inventory obsolescence	830
Loss on disposal of assets	706	118
Deferred income taxes	4,094	83
Loss on debt extinguishment	4,305
Changes in operating assets and liabilities
Accounts receivable	(12,647)	(25,996)
Inventories	(14,943)	(16,493)
Prepaid expenses and other assets	2,387	(1,248)
Accounts payable	7,302	12,445
Accrued expenses and other liabilities	4,417	4,304
Net cash provided by operating activities	80,705	6,423
Cash flows from investing activities
Capital expenditures	(32,128)	(16,468)
Proceeds from sale of assets	780	586
Net cash used in investing activities	(31,348)	(15,882)
Cash flows from financing activities
Principal payments on long-term debt	(248,529)	(1,284)
Revolver Borrowings		5,000
Payments on capital leases	(2,788)	(860)
Net proceeds from IPO	469,621
Distributions to members	(30,275)
Redemptions of CW Units	(216,425)
Net cash (used in) provided by financing activities	(28,396)	2,856
Effect of exchange rate changes on cash and cash equivalents	(132)	49
Net increase (decrease) in cash and cash equivalents	20,829	(6,554)
Cash and cash equivalents
Beginning of period	7,574	8,688
End of period	$ 28,403	$ 2,134