Debt Obligations, Junior Subordinated Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Obligations
Debt Carrying Value	$ 157,117,130	$ 156,391,419
Junior subordinated notes
Debt Obligations
Debt Carrying Value	157,100,000	156,400,000
Deferred amount Due at maturity	15,500,000	16,000,000
Deferred fees expensed as interest expense	$ 3,300,000	$ 3,400,000
Variable interest rate, description	three-month LIBOR
Nonredeemable period from issue date (in years)	2 years
Weighted average note rate (as a percent)	3.12%	3.01%
Weighted average note rate including certain fees and costs (as a percent)	3.55%	3.18%