Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activties
Net loss	$ (558,353)us-gaap_ProfitLoss	$ (641,832)us-gaap_ProfitLoss	$ (683,687)us-gaap_ProfitLoss
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation, depletion and amortization	418,748	447,704	525,508
Amortization of acquired sales contracts, net	(13,187)	(9,457)	(25,189)
Prepaid royalties expensed	9,698us-gaap_AmortizationOfAdvanceRoyalty	13,706us-gaap_AmortizationOfAdvanceRoyalty	22,650us-gaap_AmortizationOfAdvanceRoyalty
Deferred income taxes	25,152	(263,099)	(336,036)
Employee stock-based compensation expense	9,847us-gaap_ShareBasedCompensation	11,790us-gaap_ShareBasedCompensation	11,822us-gaap_ShareBasedCompensation
Gains on disposals and divestitures	(27,512)	(120,321)	0
Asset impairment and mine closure costs	16,868	220,879	531,234
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	265,423us-gaap_GoodwillImpairmentLoss	330,680us-gaap_GoodwillImpairmentLoss
Amortization of premiums on debt securities held	0	3,680
Amortization relating to financing activities	17,363	24,789	20,238
Net loss resulting from early retirement of debt and financing activities		(42,921)us-gaap_NonoperatingIncomeExpense	(23,668)us-gaap_NonoperatingIncomeExpense
Changes in:
Receivables	(8,991)us-gaap_IncreaseDecreaseInReceivables	62,881us-gaap_IncreaseDecreaseInReceivables	113,531us-gaap_IncreaseDecreaseInReceivables
Inventories	41,548us-gaap_IncreaseDecreaseInInventories	44,635us-gaap_IncreaseDecreaseInInventories	9,468us-gaap_IncreaseDecreaseInInventories
Coal derivative assets and liabilities	5,449	3,606	(13,158)
Accounts payable, accrued expenses and other current liabilities	41,680	(78,126)	(170,430)
Asset retirement obligations	18,288	17,432	(42,531)
Pension, postretirement and other postemployment benefits	(25,347)	7,284	12,319
Other	(4,833)	1,847	2,717
Cash provided by (used in) operating activities	(33,582)	55,742	332,804
Investing activities
Capital expenditures	(147,286)	(296,984)	(395,225)
Minimum royalty payments	(7,317)	(14,947)	(13,269)
Proceeds from sale-leaseback transactions	0	34,919
Proceeds from disposals and divestitures	62,358	433,453	22,825
Purchases of short term investments	211,929	213,726	236,862
Proceeds from sales of short term investments	205,611	194,537	1,754
Proceeds from Sale of Available-for-sale Securities, Equity	9,464	0	0
Investments in and advances to affiliates, net	(16,657)	(15,260)	(17,758)
Purchase of noncontrolling interest	0	0	(17,500)
Change in restricted cash	0	3,453	6,869
Cash provided by (used in) investing activities	(105,756)	125,445	(649,166)
Financing activities
Proceeds from Issuance of Secured Debt		294,000	1,633,500
Proceeds from issuance of senior notes	0	350,000	359,753
Payments to retire debt	(300)us-gaap_RepaymentsOfLongTermDebt	(628,660)us-gaap_RepaymentsOfLongTermDebt	(452,934)us-gaap_RepaymentsOfLongTermDebt
Payments on term loan	(19,500)us-gaap_RepaymentsOfSecuredDebt	(17,250)us-gaap_RepaymentsOfSecuredDebt	(7,625)us-gaap_RepaymentsOfSecuredDebt
Net decrease in borrowings under lines of credit	0		(481,300)
Net payments on other debt	(5,395)	(6,836)	(682)
Debt financing costs	(4,519)us-gaap_PaymentsOfFinancingCosts	(20,489)us-gaap_PaymentsOfFinancingCosts	(50,568)us-gaap_PaymentsOfFinancingCosts
Dividends paid	(2,123)us-gaap_PaymentsOfDividends	(25,475)us-gaap_PaymentsOfDividends	(42,440)us-gaap_PaymentsOfDividends
Proceeds from exercise of options under incentive plans			5,131
Other	(5,693)	0	0
Cash provided by (used in) financing activities	(37,530)	(54,710)	962,835
Increase (decrease) in cash and cash equivalents	(176,868)	126,477	646,473
Cash and cash equivalents, beginning of period	911,099	784,622	138,149
Cash and cash equivalents, end of period	734,231	911,099	784,622
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid during the year for interest	361,727us-gaap_InterestPaid	380,389us-gaap_InterestPaid	310,241us-gaap_InterestPaid
Cash refunded during the year for income taxes, net	$ (4,896)us-gaap_IncomeTaxesPaidNet	$ (18,741)us-gaap_IncomeTaxesPaidNet	$ (28,057)us-gaap_IncomeTaxesPaidNet

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The cash outflow associated with the purchase of noncontrolling interest during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

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- Definition

The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a),(b)

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

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- Definition

The cash outflow from the purchase of royalty interests in mining properties is the amount of cash the mineral producer pays the owner of the mine or mineral resource.

+ References

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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-SubTopic 10

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-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

-Paragraph 14

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

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-Paragraph 4K

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-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

+ References

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- Definition

Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757

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-SubTopic 40

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-Paragraph 52

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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