Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activties
Net income (loss)	$ (70,049)	$ 1,409
Adjustments to reconcile to cash provided by operating activities:
Depreciation, depletion and amortization	118,868	139,966
Amortization of acquired sales contracts, net	(2,810)	(14,017)
Amortization relating to financing activities	6,167	4,288
Prepaid royalties expensed	3,537	8,586
Employee stock-based compensation expense	2,713	4,079
Changes in:
Receivables	(12,340)	88,082
Inventories	(2,816)	(111,196)
Coal derivative assets and liabilities	(192)	(5,347)
Accounts payable, accrued expenses and other current liabilities	38,249	(66,222)
Income taxes, net	458	23,002
Deferred income taxes	(54,801)	(21,742)
Other	16,307	4,102
Cash provided by operating activities	43,291	54,990
Investing activities
Capital expenditures	(54,522)	(93,271)
Minimum royalty payments	(9,142)	(8,262)
Proceeds from dispositions of property, plant and equipment	714	22,105
Purchases of short term investments	(26,787)
Proceeds from Sale of Short-term Investments	11,534
Investments in and advances to affiliates	(4,298)	(5,777)
Change in restricted cash	1,163	1,455
Cash used in investing activities	(81,338)	(83,750)
Financing activities
Net increase (decrease) in borrowings under lines of credit		34,000
Payments on term note	(4,125)
Net payments on other debt	(5,964)	(7,323)
Debt financing costs		(100)
Dividends paid	(6,367)	(23,327)
Issuance of common stock under incentive plans		5,131
Cash provided by (used in) financing activities	(16,456)	8,381
Increase (decrease) in cash and cash equivalents	(54,503)	(20,379)
Cash and cash equivalents, beginning of period	784,622	138,149
Cash and cash equivalents, end of period	$ 730,119	$ 117,770