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Debt Obligations (Details 6) - Range [Domain] - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2010
Dec. 31, 2014
Debt Obligations      
Debt Carrying Value $ 160,108,568   $ 159,833,260
Junior subordinated notes      
Debt Obligations      
Debt Carrying Value 160,100,000   159,800,000
Deferred amount Due at maturity $ 15,700,000   $ 16,000,000
Variable interest rate, description three-month LIBOR    
Nonredeemable period from issue date (in years) 2 years    
Weighted average note rate (as a percent) 3.05%   3.01%
Weighted average note rate including certain fees and costs (as a percent) 3.21%   3.18%
Amount of retired debt instrument   $ 114,100,000