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Use of Derivative Financial Instruments - FV of Interest Rate Swaps (Details)
$ in Thousands
Sep. 30, 2015
USD ($)
derivative
Dec. 31, 2014
USD ($)
Fair value of the interest rate swaps outstanding    
Fair value - assets $ 0 $ 959
Fair value - liabilities (6,956) (873)
Unsecured Debt Swaps | Interest Rate Swaps    
Fair value of the interest rate swaps outstanding    
Notional amount assets 0 125,000
Fair value - assets 0 959
Notional amount liabilities 300,000 100,000
Fair value - liabilities $ (6,956) $ (873)
Number of interest rate swaps with no current notional amount | derivative 4