CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net (loss) income	$ (80,127)	$ (109,544)	$ 55,588
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	48,451	54,457	50,860
Provision for doubtful accounts	918	1,857	546
Deferred income taxes	(50,535)	(56,800)	24,389
Excess tax benefits from stock based compensation			(372)
Lower of cost or market inventory adjustment	1,515	4,546	5,363
Loss on disposal or impairment of assets, net	889	44,111	15,079
Foreign currency transaction (gain) loss, net	(119)	(94)	303
Stock compensation expense	5,939	7,547	7,529
Change in fair value of derivative instruments	(7,687)	11,155
Changes in operating assets and liabilities:
Trade accounts and other receivables	24,569	81,371	(9,511)
Inventories	6,433	27,022	(25,624)
Prepaid expenses and other current assets	1,726	1,437	(112)
Long-term other assets	156	697	(122)
Accounts payable	631	(7,861)	2,079
Accrued expenses	(8,405)	(9,104)	(2,487)
Other long-term liabilities	1,574	0	0
Income tax receivable, net	36,137	19,780	(17,726)
Net cash (used in) provided by operating activities	(17,935)	70,577	105,782
Investing activities
Capital expenditures	(6,848)	(62,747)	(161,469)
Net cash used in investing activities	(6,848)	(62,747)	(161,469)
Financing activities
Proceeds from long-term debt		70,000	25,000
Repayments on long-term debt	(32,099)	(7,000)
Repayments on notes payable	(917)	0	0
Payment of debt issuance costs	(339)	0	0
Proceeds from notes payable, related parties	25,000	0	0
Dividends paid		(14,666)	(29,121)
Purchase of common stock	(450)	(580)	(6,979)
Excess tax benefits from stock based compensation			372
Net cash provided by (used in) financing activities	36,759	47,754	(10,728)
Effect of exchange rate changes on cash	838	(1,016)	(3,537)
Net increase (decrease) in cash and cash equivalents	12,814	54,568	(69,952)
Cash and cash equivalents at beginning of year	78,866	24,298	94,250
Cash and cash equivalents at end of year	91,680	78,866	24,298
Supplemental cash flow information
Interest paid	5,269	2,613	135
Income taxes paid			30,619
ATM Program
Financing activities
Proceeds from issuance of common stock under ATM program	$ 45,564	$ 0	$ 0