CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net (loss) income	$ (28,602)	$ 18,427
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	12,994	11,803
Provision for doubtful accounts	91	89
Deferred income taxes	(14,043)	482
Excess tax benefits from stock based compensation		(372)
Lower of cost or market inventory adjustment	4,372
Gain on disposal of assets	(32)	(8)
Foreign currency transaction loss, net	48	23
Stock compensation expense	2,242	2,086
Loss on derivative instruments	12,547
Changes in operating assets and liabilities:
Trade accounts and other receivables	63,785	17,701
Inventories	1,871	(7,352)
Prepaid expenses and other current assets	711	680
Long-term prepaid expenses	78	(1,927)
Accounts payable	(6,778)	134
Accrued expenses	(11,648)	(6,235)
Accrued income taxes, net	15,479	8,578
Net cash provided by operating activities	53,115	44,109
Investing activities
Capital expenditures	(22,887)	(38,908)
Net cash used in investing activities	(22,887)	(38,908)
Financing activities
Proceeds from bank borrowings	50,000
Dividends paid	(7,682)	(6,945)
Purchase of common stock	(549)	(5,779)
Excess tax benefits from stock based compensation		372
Net cash provided by (used in) financing activities	41,769	(12,352)
Effect of exchange rate changes on cash	(152)	(1,001)
Net increase (decrease) in cash and cash equivalents	71,845	(8,152)
Cash and cash equivalents at beginning of period	24,298	94,250
Cash and cash equivalents at end of period	96,143	86,098
Supplemental cash flow information
Interest paid	164	10
Income taxes paid		$ 16