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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Carrying Value of Debt to be Fair Valued [Roll Forward]  
Long-term Debt at December 31, 2012 $ 2,657,398
Fixed Rate Debt [Member]
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Calculation, Input, Discount Rate 2.87%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair Value of long-term debt at December 31, 2011 2,215,219 [1]
Payoffs and amortization of long-term debt (265,200)
New long-term debt 747,136
Changes in fair value inputs 148,554
Fair Value of long-term debt at December 31, 2012 2,845,709 [1]
Carrying Value of Debt to be Fair Valued [Roll Forward]  
Long-term Debt at December 31, 2011 2,083,462 [1]
Repayments of Long-term Debt (265,200)
Proceeds from Issuance of Long-term Debt 747,136
Long-term Debt at December 31, 2012 2,565,398 [1]
Fair Value Above (Below) Carrying Value [Roll Forward]  
Fair Value of Debt, Greater than Aggregate Carrying Value at December 31, 2011 131,757 [1]
Changes in fair value inputs 148,554
Fair Value of Debt, Greater than Aggregate Carrying Value at December 31, 2012 $ 280,311 [1]
[1] Does not include the Company's credit facility.