Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
In Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]      
Senior Notes, Carrying Value $ 240,000 $ 240,000 $ 240,000
Senior Notes, Fair Value 264,000 273,900 273,600
Term Loan, Carrying Value 69,841 69,841 95,238
Term Loan, Fair Value 69,609 69,841 95,238
Change during period, assets at fair value 0 0  
Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]      
Senior Notes, Fair Value 264,000 273,900 273,600
Term Loan, Fair Value      
Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]      
Senior Notes, Fair Value      
Term Loan, Fair Value      
Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]      
Senior Notes, Fair Value      
Term Loan, Fair Value $ 69,609 $ 69,841 $ 95,238