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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value consideration threshold for transfer in/out of level 3 10.00%   10.00%    
Derivative expense related to credit default swaps $ 188 $ 133 $ 378 $ 189  
Minimum [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Higher Uptrend in the LIBOR interest rate 0.465%   0.465%   0.43%
Maximum [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Higher Uptrend in the LIBOR interest rate 0.73%   0.73%