Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activties
Net loss	$ (142,255)	$ (434,015)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	237,668	272,834
Amortization of acquired sales contracts, net	(5,019)	(18,468)
Amortization relating to financing activities	12,346	8,948
Prepaid royalties expensed	9,251	16,551
Employee stock-based compensation expense	5,804	7,014
Asset impairment and mine closure costs	20,482	501,942
Goodwill impairment		115,791
Net loss resulting from early retirement of debt and financing activities		19,042
Changes in:
Receivables	(3,909)	52,291
Inventories	8,771	(80,199)
Coal derivative assets and liabilities	(11,122)	(37,985)
Accounts payable, accrued expenses and other current liabilities	(4,062)	(64,965)
Income taxes, net	(29)	22,869
Deferred income taxes	(102,172)	(272,094)
Other	26,291	(14,248)
Cash provided by operating activities	52,045	95,308
Investing activities
Capital expenditures	(169,064)	(202,073)
Minimum royalty payments	(10,162)	(8,634)
Proceeds from dispositions of property, plant and equipment	5,080	22,551
Proceeds from sale-leaseback transactions	34,919
Purchases of short term investments	(61,870)
Proceeds from sales of short term investments	47,097
Investments in and advances to affiliates	(8,142)	(9,292)
Change in restricted cash	2,368	4,582
Cash used in investing activities	(159,774)	(192,866)
Financing activities
Proceeds from issuance of term loan		1,386,000
Payments on term note	(8,250)
Payments to retire debt	(255)	(452,654)
Net decrease in borrowings under lines of credit		(391,300)
Net payments on other debt	(11,448)	(11,164)
Debt financing costs		(34,381)
Dividends paid	(12,735)	(29,696)
Proceeds from exercise of options under incentive plans		5,131
Cash provided by (used in) financing activities	(32,688)	471,936
Decrease in cash and cash equivalents	(140,417)	374,378
Cash and cash equivalents, beginning of period	784,622	138,149
Cash and cash equivalents, end of period	$ 644,205	$ 512,527