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Fair Value of Financial Instruments - Fair Value, Recurring and Nonrecurring (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative liabilities, disclosed as “Interest rate contracts” $ 14 $ 192
Derivative liabilities, disclosed as “Interest rate contracts” (1,370) 0
Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 852,524 931,308
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 860,412 940,435
Interest Rate Contract | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative liabilities, disclosed as “Interest rate contracts” 14 192
Derivative liabilities, disclosed as “Interest rate contracts” (1,370) 0
Interest Rate Contract | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative liabilities, disclosed as “Interest rate contracts” 14 192
Derivative liabilities, disclosed as “Interest rate contracts” $ (1,370) $ 0