CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES
Net loss	$ (243,569)	$ (83,936)
Adjustments to reconcile net loss to net cash flows used in operating activities:
Depreciation and depletion	146,240	149,510
Deferred income tax benefit	(41,257)	(77,717)
Amortization of debt issuance costs	8,356	8,014
Loss on extinguishment of debt	2,492	6,001
Other	39,183	8,402
Decrease (increase) in current assets:
Receivables	34,710	(2,302)
Inventories	30,774	(24,281)
Prepaid expenses and other current assets	(6,437)	(8,826)
Increase (decrease) in current liabilities:
Accounts payable	(32,227)	24,483
Accrued interest	9,168	8,245
Accrued expenses and other current liabilities	13,559	(31,695)
Cash flows used in operating activities	(39,008)	(24,102)
INVESTING ACTIVITIES
Additions to property, plant and equipment	(43,476)	(80,251)
Other	(350)	964
Cash flows used in investing activities	(43,826)	(79,287)
FINANCING ACTIVITIES
Proceeds from issuance of debt	553,000	450,000
Retirements of debt	(414,124)	(259,200)
Dividends paid	(1,284)	(15,638)
Debt issuance costs	(21,325)	(15,080)
Other	(191)	(600)
Cash flows provided by financing activities	116,076	159,482
Effect of foreign exchange rates on cash	(588)	(1,816)
Net increase in cash and cash equivalents	32,654	54,277
Cash and cash equivalents at beginning of period	260,818	116,601
Cash and cash equivalents at end of period	$ 293,472	$ 170,878