Mortgage Loans (Schedule of Fair Value, Principal Balance and Weighted Average Coupon and Yield) (Details) (Mortgage Receivable [Member], USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2014		Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	$ 489,964,409		$ 398,828,497
Premium (Discount)	(86,197,696)		(74,179,437)
Amortized Cost	403,766,713		324,649,060
Gross Unrealized
Gains	35,129,167	[1]	13,386,924	[2]
Losses	(5,342,160)	[1]	(6,250,442)	[2]
Fair Value	433,553,720		331,785,542
Weighted Average Coupon	4.25%		4.24%
Weighted Average Yield	7.03%	[3]	6.91%	[3]
Fixed [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	282,361,337		212,701,494
Premium (Discount)	(54,730,082)		(43,530,581)
Amortized Cost	227,631,255		169,170,913
Gross Unrealized
Gains	24,102,606	[1]	7,842,598	[2]
Losses	(1,640,726)	[1]	(3,558,171)	[2]
Fair Value	250,093,135		173,455,340
Weighted Average Coupon	4.51%		4.56%
Weighted Average Yield	7.03%	[3]	7.05%	[3]
ARM [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	176,654,287		170,178,466
Premium (Discount)	(23,903,555)		(25,617,563)
Amortized Cost	152,750,732		144,560,903
Gross Unrealized
Gains	10,012,628	[1]	5,088,302	[2]
Losses	(830,771)	[1]	(1,556,430)	[2]
Fair Value	161,932,589		148,092,775
Weighted Average Coupon	3.68%		3.76%
Weighted Average Yield	6.94%	[3]	6.67%	[3]
Performing Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	459,015,624		382,879,960
Premium (Discount)	(78,633,637)		(69,148,144)
Amortized Cost	380,381,987		313,731,816
Gross Unrealized
Gains	34,115,234	[1]	12,930,900	[2]
Losses	(2,471,497)	[1]	(5,114,601)	[2]
Fair Value	412,025,724		321,548,115
Weighted Average Coupon	4.19%		4.20%
Weighted Average Yield	7.00%	[3]	6.88%	[3]
Nonperforming Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	30,948,785	[4]	15,948,537	[4]
Premium (Discount)	(7,564,059)	[4]	(5,031,293)	[4]
Amortized Cost	23,384,726	[4]	10,917,244	[4]
Gross Unrealized
Gains	1,013,933	[1],[4]	456,024	[2],[4]
Losses	(2,870,663)	[1],[4]	(1,135,841)	[2],[4]
Fair Value	$ 21,527,996	[4]	$ 10,237,427	[4]
Weighted Average Coupon	5.09%	[4]	5.06%	[4]
Weighted Average Yield	7.65%	[3],[4]	8.03%	[3],[4]

[1] The Company has elected the fair value option pursuant to ASC 825 for its mortgage loans. The Company recorded a gain of $22.0 million and a gain of $1.6 million for the three months ended June 30, 2014 and June 30, 2013, respectively, and $22.7 million and $1.6 million for the six months ended June 30, 2014 and June 30, 2013, respectively, as change in unrealized gain or loss on mortgage loans in the consolidated statements of operations.

[2] The Company has elected the fair value option pursuant to ASC 825 for its mortgage loans.

[3] Unleveraged yield.

[4] Loans that are delinquent for 60 days or more are considered non-performing.