Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activties
Net loss	$ (124,139)	$ (70,049)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation, depletion and amortization	104,423	118,868
Amortization of acquired sales contracts, net	(3,696)	(2,810)
Amortization relating to financing activities	3,236	6,167
Prepaid royalties expensed	1,803	3,537
Employee stock-based compensation expense	2,333	2,713
Gains on disposals and divestitures, net	(15,129)	(595)
Changes in:
Receivables	(27,245)	(12,340)
Inventories	7,441	(2,816)
Accounts payable, accrued expenses and other current liabilities	43,989	38,249
Income taxes, net	(115)	458
Deferred income taxes	(43,698)	(54,993)
Other	10,522	16,902
Cash provided by (used in) operating activities	(40,275)	43,291
Investing activities
Capital expenditures	(14,454)	(54,522)
Additions to prepaid royalties	(591)	(9,142)
Proceeds from disposals and divestitures	28,195	714
Purchases of short term investments	(119,176)	(26,787)
Proceeds from sales of short term investments	117,681	11,534
Investments in and advances to affiliates	(3,242)	(4,298)
Change in restricted cash	0	1,163
Cash provided by (used in) investing activities	8,413	(81,338)
Financing activities
Payments on term loan	(4,875)	(4,125)
Net payments on other debt	(4,521)	(5,964)
Debt financing costs	(1,957)
Dividends paid	(2,123)	(6,367)
Cash used in financing activities	(13,476)	(16,456)
Decrease in cash and cash equivalents	(45,338)	(54,503)
Cash and cash equivalents, beginning of period	911,099	784,622
Cash and cash equivalents, end of period	$ 865,761	$ 730,119