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Debt Obligations (Details 6) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2013
Debt Obligations        
Debt Carrying Value $ 159,695,009     $ 159,291,427
Common stock issued to entity     7,400,000  
Junior subordinated notes
        
Debt Obligations        
Debt Carrying Value 159,700,000     159,300,000
Deferred amount Due at maturity 16,200,000     16,600,000
Face amount     289,400,000  
Variable interest rate, description three-month LIBOR   three month LIBOR  
Nonredeemable period from issue date (in years) 2 years      
Weighted average note rate (as a percent) 3.01%     3.01%
Effective rate (as a percent) 3.05%     3.06%
Weighted average note rate including certain fees and costs (as a percent) 3.16%     3.18%
Amount of retired debt instrument   114,100,000 258,400,000  
Percentage of original face amount at which debt was issued     112.00%  
Weighted average spread (as a percent)     2.77%  
Percentage above face value at which debt was issued (as a percent) 12.00%      
Transaction fees related to the restructuring of notes 1,300,000      
Retired outstanding trust preferred securities
        
Debt Obligations        
Amount of retired debt instrument     $ 265,800,000