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Fair Value of Financial Instruments - Fair Value, Recurring and Nonrecurring (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable, carrying value $ 920,860 $ 931,308
Notes payable, fair value 924,357 940,435
Derivative assets, disclosed as “Interest rate contracts” 15 192
Derivative liabilities, disclosed as “Interest rate contracts” 907 0
Interest Rate Contracts
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets, disclosed as “Interest rate contracts” 15 192
Derivative liabilities, disclosed as “Interest rate contracts” 907 0
Interest Rate Contracts | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets, disclosed as “Interest rate contracts” 15 192
Derivative liabilities, disclosed as “Interest rate contracts” $ 907 $ 0