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Guarantor Subsidiaries Financial Information Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 3,241,474us-gaap_LongTermDebt	$ 3,118,920us-gaap_LongTermDebt
Senior notes due April 2020 at 8.25%
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	1,014,800	1,250,000
Senior notes due March 2021 at 6.375%
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	250,000	250,000
Senior Secured Notes Due April 2022 Par Value [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt			$ 1,856,506

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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