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Long-Term Debt Activity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended6 Months Ended9 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Sep. 30, 2011
Sep. 30, 2010
Sep. 07, 2011
Jun. 03, 2011
Dec. 31, 2010
Mar. 02, 2010
Long-Term Debt Activity (Textual) [Abstract]        
Interest rate on senior subordinated notes7.375% 7.375%     
Carrying value of long-term debt$ 1,574,437 $ 1,574,437   $ 1,532,441 
Additional Long Term Debt Activity (Textual) [Abstract]        
Payment of debt issue costs  (4,539)(8,849)    
Price to repurchase the senior subordinated notes as a percentage of the aggregate principal amount outstanding plus accrued and unpaid interest in case of change of control  101.00%     
Price to repurchase the senior subordinated notes as a percentage of the aggregate principal amount outstanding plus accrued and unpaid interest in case of disposition of certain assets  100.00%     
Terms related to proceeds from asset dispositions Notes at 100% of their principal amount, plus accrued and unpaid interest, if any, to the date of repurchase if such proceeds are not otherwise used within 365 days as described in the indenture      
Price to repurchase the senior subordinated notes as a percentage of principal amount plus a make-whole premium in case of redemption at option of company prior to specific date  100.00%     
Maximum percentage of principal amount of the senior subordinated notes that can be redeemed prior to specific date  35.00%     
Amount of senior subordinated notes exchanged (approximately)    199,500   
Amount of senior subordinated notes not exchanged (approximately)500 500     
Prepayment Penalties Incurred Upon Early Repayment Of Senior Debt     0  
Quarterly term loan payments due on the term loan  2,311     
Wrote-off in unamortized debt issue costs related to early retirement of debt2,183       
Amortization of accumulated other comprehensive loss related to interest rate swap agreement2,760 2,760     
Term loan debt outstanding908,199 908,199     
Borrowing outstanding under revolving credit line0 0     
Fees of loss on early retirement of debt  2     
Fair value of long-term debt1,577,994 1,577,994   1,581,963 
Extended amount outstanding of senior secured credit facility, approximate value       924,375
Term Loan of Senior Secured Credit Facility Not Extended       159,225
Maturity date of senior secured credit facility       2013-10
7.375% Senior Subordinated Notes [Member]
        
Long-Term Debt Activity (Textual) [Abstract]        
Aggregate principal amount issued     200,000  
Interest rate on senior subordinated notes     7.375%  
Senior subordinated 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, 2016866,602 866,602     
Extended Term Loan of Senior Secured Credit Facility [Member]
        
Long-Term Debt Activity (Textual) [Abstract]        
Amount of term loan debt extended       $ 1,083,600