Derivative Financial Instruments - Income Statement Effect (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	$ (1,376,963)	$ (14,191,436)
Eurodollar Future [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	(1,377,000)	(9,838,000)
InterestRateSwaptionMember
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	0	(4,439,000)
Treasury Note Future [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	0	86,000
Parent Co [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	(1,377,000)	(266,000)
Parent Co [Member] | Eurodollar Future [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	(1,377,000)	(280,000)
Parent Co [Member] | InterestRateSwaptionMember
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	0	0
Parent Co [Member] | Treasury Note Future [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains on derivative instruments	$ 0	$ 14,000