Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activties
Net loss	$ (220,999)	$ (142,255)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation, depletion and amortization	206,887	237,668
Amortization of acquired sales contracts, net	(6,935)	(5,019)
Amortization relating to financing activities	7,757	12,346
Prepaid royalties expensed	3,575	9,251
Employee stock-based compensation expense	5,469	5,804
Asset impairment costs	1,512	20,482
Gains on disposals and divestitures, net	(18,506)	(2,819)
Deferred income taxes	(78,568)	(102,172)
Changes in:
Receivables	267	(3,909)
Inventories	3,522	8,771
Accounts payable, accrued expenses and other current liabilities	10,495	(4,062)
Income taxes, net	(571)	(29)
Other	7,749	17,988
Cash provided by (used in) operating activities	(78,346)	52,045
Investing activities
Capital expenditures	(95,746)	(169,064)
Payments of minimum royalties	(3,341)	(10,162)
Proceeds from sale-leaseback transactions	0	5,080
Proceeds from disposals and divestitures	43,245	34,919
Purchases of short term investments	(168,951)	(61,870)
Proceeds from sales of short term investments	166,018	47,097
Investments in and advances to affiliates	(9,501)	(8,142)
Change in restricted cash	0	2,368
Cash used in investing activities	(68,276)	(159,774)
Financing activities
Payments on term loan	(9,750)	(8,250)
Net payments on other debt	(9,390)	(11,703)
Debt financing costs	(1,957)
Dividends paid	(2,123)	(12,735)
Change in restricted cash	(1,103)	0
Cash used in financing activities	(24,323)	(32,688)
Decrease in cash and cash equivalents	(170,945)	(140,417)
Cash and cash equivalents, beginning of period	911,099	784,622
Cash and cash equivalents, end of period	$ 740,154	$ 644,205