CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income		$ 67,950
Net income	$ 89,196
Reconciliation of net income (loss) to net cash provided by operating activities
Depreciation and amortization	18,257	13,988
Debt discount and deferred loan cost amortization	84	219
Stock-based compensation	3,568	2,097
Inventory obsolescence	1,188	830
Loss on disposal of assets	1,403	706
Deferred income taxes	7,060	4,094
Loss on debt extinguishment		4,305
Changes in operating assets and liabilities:
Accounts receivable	(20,696)	(12,647)
Inventories	(12,010)	(14,943)
Prepaid expenses and other assets	4,612	2,387
Accounts payable	1,691	7,302
Accrued expenses and other liabilities	7,316	4,417
Operating lease liabilities	(3,351)
Net cash provided by operating activities	98,318	80,705
Cash flows from investing activities
Capital expenditures and other	(29,924)	(32,128)
Proceeds from sale of assets	1,175	780
Net cash used in investing activities	(28,749)	(31,348)
Cash flows from financing activities
Principal payments on long-term debt		(248,529)
Payments on finance leases	(3,723)
Payments on finance leases		(2,788)
Net proceeds from equity offerings		469,621
Distributions to members	(3,848)	(30,275)
Redemption of CW Units		(216,425)
Repurchase of shares	(1,516)
Net cash used in financing activities	(9,087)	(28,396)
Effect of exchange rate changes on cash and cash equivalents	(174)	(132)
Net increase in cash and cash equivalents	60,308	20,829
Cash and cash equivalents
Beginning of period	70,841	7,574
End of period	$ 131,149	$ 28,403