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Long-Term Debt Activity (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
7.375% Senior Subordinated Notes [Member]
Jun. 03, 2011
7.375% Senior Subordinated Notes [Member]
Jun. 03, 2012
Senior secured credit facility [Member]
Sep. 30, 2012
Senior secured credit facility [Member]
Sep. 30, 2012
Revolving credit line [Member]
Long-Term Debt (Textual) [Abstract]                
Aggregate principal amount issued         $ 200,000      
Interest rate on notes         7.375%      
Notes, maturity date       Jun. 15, 2021        
Prepayment of term loan outstanding under its senior secured credit facility           157,235    
Debt issuance cost             4,500  
Equal quarterly installments due on term loan   2,311   2,311        
Remaining principal amount on the extended amount due April 30, 2016       866,602        
Term loan debt outstanding               898,955
Borrowing outstanding under revolving credit line 0              
Long-Term Debt (Additional Textual) [Abstract]                
Prepayment penalties incurred upon early repayment of senior debt 0              
Carrying value of long-term debt 1,563,470   1,572,221          
Fair value of long-term debt 1,690,221   1,622,286          
Write off of unamortization of debt issuance cost 2,183              
Reclassification adjustment included in Accumulated comprehensive loss 2,760              
Fees on early retirement of debt   $ 2