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Fair Value Measurement (Details Textual) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair value of long-term debt
Carrying value of debt instrument	$ 810,365,000	$ 810,888,000
Second lien notes [Member]
Fair value of long-term debt
Carrying value of debt instrument	325,000,000	325,000,000
Second lien notes [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value of long-term debt
Fair value of debt instrument	337,200,000	335,600,000
Carrying value of debt instrument	325,000,000	325,000,000
2011 Credit Agreement [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value of long-term debt
Fair value of debt instrument	479,100,000	479,800,000
Carrying value of debt instrument	$ 485,400,000	$ 489,600,000

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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