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Long -Term Debt Activity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
7.375% Senior Subordinated Notes [Member]
Jun. 03, 2011
7.375% Senior Subordinated Notes [Member]
Mar. 31, 2012
Senior secured credit facility [Member]
Mar. 31, 2012
Revolving credit line [Member]
Long-Term Debt (Textual) [Abstract]            
Aggregate principal amount issued       $ 200,000    
Interest rate on note       7.375%    
Notes, maturity date     Jun. 15, 2021      
Prepayment of term loan outstanding under its senior secured credit facility         157,235  
Remaining principal amount on the extended amount Due April 30, 2016     866,602      
Equal quarterly installments due on term loan 2,311          
Borrowing outstanding under revolving credit line           0
Term loan debt outstanding 903,577          
Long-Term Debt (Additional Textual) [Abstract]            
Prepayment penalties incurred upon early repayment of senior debt 0          
Carrying value of long-term debt 1,569,329 1,572,221        
Fair value of long-term debt $ 1,645,857 $ 1,622,286