Long-Term Debt (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Credit Agreement	$ 0	$ 0
Capital Lease Obligations	5,620,000	6,806,000
Total	2,296,734,000	2,424,156,000
Less current obligations	8,622,000	7,948,000
Long-term debt and capital lease obligations	2,288,112,000	2,416,208,000
7.5% Senior Subordinated Notes due 2013 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	0	224,563,000
7.5% Senior Subordinated Notes due 2015 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	0	300,427,000
9.5% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	238,142,000	239,509,000
9.75% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	406,354,000	404,211,000
6 3/8% Senior Subordinated Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	400,000,000	0
8.25% Senior Subordinated Notes due 2020 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	996,273,000	996,273,000
Other Subordinated Notes [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	3,842,000	3,848,000
NEJD Financing [Member]
Debt Instrument [Line Items]
Financing Lease Obligations	165,550,000	167,331,000
Free State Financing [Member]
Debt Instrument [Line Items]
Financing Lease Obligations	$ 80,953,000	$ 81,188,000

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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