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Fair Value Measurements (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Impairment of CMBS $ 456 $ 0 $ 1,023 $ 0
Deferred acquisition fees payable        
Fair Value Inputs        
Leverage adjusted unsecured spread     2.05%  
Illiquidity Adjustment     0.75%