CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities
Net (loss) income	$ (45,606)	$ 41,444
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	27,006	23,706
Provision for doubtful accounts	201	246
Deferred income taxes	(23,512)	2,485
Excess tax benefits from stock based compensation		(372)
Lower of cost or market and other inventory adjustments	4,372
Gain on disposal of assets	(163)	(191)
Foreign currency transaction loss (gain), net	49	(26)
Stock compensation expense	4,457	4,454
Loss on derivative instruments	10,958
Changes in operating assets and liabilities:
Trade accounts and other receivables	63,418	(6,726)
Inventories	17,647	(2,074)
Prepaid expenses and other current assets	(866)	(3,316)
Long-term other assets	801	500
Accounts payable	(5,072)	4,348
Accrued expenses	(10,304)	(4,875)
Accrued income taxes, net	16,064	(2,099)
Net cash provided by operating activities	59,450	57,504
Investing activities
Capital expenditures	(36,660)	(85,487)
Net cash used in investing activities	(36,660)	(85,487)
Financing activities
Proceeds from bank borrowings	70,000
Dividends paid	(10,009)	(13,876)
Purchase of common stock	(549)	(5,779)
Excess tax benefits from stock based compensation		372
Net cash provided by (used in) financing activities	59,442	(19,283)
Effect of exchange rate changes on cash	54	(605)
Net increase (decrease) in cash and cash equivalents	82,286	(47,871)
Cash and cash equivalents at beginning of period	24,298	94,250
Cash and cash equivalents at end of period	106,584	46,379
Supplemental cash flow information
Interest paid	$ 674	3
Income taxes paid		$ 17,153