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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activties      
Net income (loss) $ (683,687) $ 142,840 $ 159,394
Adjustments to reconcile to cash provided by operating activities:      
Depreciation, depletion and amortization 525,508 466,587 365,066
Amortization of acquired sales contracts, net (25,189) (22,069) 35,606
Noncash mine closure and asset impairment costs 515,491 7,316   
Goodwill and other intangible asset impairment 346,423      
Bridge financing costs related to ICG    49,490   
Amortization relating to financing activities 20,238 14,067 10,398
Net loss resulting from early retirement of debt and refinancing activities 23,668 1,958 6,776
Prepaid royalties expensed 22,650 34,842 34,605
Employee stock-based compensation expense 11,822 10,882 11,717
Gain on Knight Hawk transaction       (41,577)
Changes in:      
Receivables 113,531 (74,914) (7,287)
Inventories 9,468 (50,900) 5,160
Coal derivative assets and liabilities (13,158) 6,079 9,554
Accounts payable, accrued expenses and other current liabilities (171,580) 52,191 87,807
Income taxes, net 27,545 (21,759) (1,364)
Deferred income taxes (336,036) 10,519 (12,405)
Increase (Decrease) in Asset Retirement Obligations (42,531) 3,868 23,997
Other (11,359) 11,245 9,700
Cash provided by operating activities 332,804 642,242 697,147
Investing activities      
Acquisition of ICG, net of cash acquired    (2,894,339)   
Capital expenditures (395,225) (540,936) (314,657)
Additions to prepaid royalties (13,269) (29,957) (27,355)
Proceeds from dispositions of property, plant and equipment 22,825 25,887 330
Purchases of short term investments (236,862)      
Proceeds from Sale of Short-term Investments 1,754      
Investments in and advances to affiliates (17,758) (61,909) (46,185)
Purchase of noncontrolling interest (17,500)      
Change in restricted cash 6,869 5,167   
Consideration paid related to prior business acquisition    (829) (1,262)
Cash used in investing activities (649,166) (3,496,916) (389,129)
Financing activities      
Proceeds from the issuance of senior notes 359,753 2,000,000 500,000
Proceeds from term note 1,633,500      
Proceeds from the issuance of common stock, net    1,267,933   
Payments to retire debt (452,934) (605,178) (505,627)
Net increase (decrease) in borrowings under lines of credit and commercial paper program (481,300) 424,396 (196,549)
Payments on term note (7,625)      
Net payments on other debt (682) 5,334 82
Debt financing costs (50,568) (114,823) (12,751)
Dividends paid (42,440) (80,748) (63,373)
Issuance of common stock under incentive plans 5,131 2,316 1,764
Proceeds from Noncontrolling Interests       891
Cash provided by (used in) financing activities 962,835 2,899,230 (275,563)
Increase (decrease) in cash and cash equivalents 646,473 44,556 32,455
Cash and cash equivalents, beginning of period 138,149 93,593 61,138
Cash and cash equivalents, end of period 784,622 138,149 93,593
Cash paid during the year for interest 310,241 213,697 134,866
Cash refunded (paid) during the year for income taxes, net $ 28,057 $ (7,094) $ (36,765)