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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Note receivable $ 49,495 $ 53,792
Debt, fair value 1,077,661 988,731
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Note receivable 66,000 57,000
Debt, fair value $ 1,121,776 $ 1,035,450