Long-Term Debt (Components of Long-Term Debt) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Bank Credit Facility	$ 625,000,000	$ 385,000,000
Capital Lease Obligations	165,447,000	4,388,000
Total	3,075,500,000	2,678,045,000
Less current obligations	(36,635,000)	(8,316,000)
Long-term debt and capital lease obligations	3,038,865,000	2,669,729,000
9.5% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	234,722,000	236,774,000
Including premium of	9,802,000	11,854,000
Debt Instrument, Interest Rate, Stated Percentage	9.50%
9.75% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	411,710,000	408,496,000
Including discount of	14,640,000	17,854,000
Debt Instrument, Interest Rate, Stated Percentage	9.75%
6 3/8% Senior Subordinated Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	400,000,000	400,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.375%
8.25% Senior Subordinated Notes due 2020 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	996,273,000	996,273,000
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Other Subordinated Notes [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	3,834,000	3,840,000
Including premium of	27,000	33,000
NEJD Financing [Member]
Debt Instrument [Line Items]
Financing Lease Obligations	160,684,000	163,677,000
Free State Financing [Member]
Debt Instrument [Line Items]
Financing Lease Obligations	$ 77,830,000	$ 79,597,000