DERIVATIVE INSTRUMENTS HEDGING AND NON-HEDGING ACTIVITIES (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	$ 594,877,852		$ 412,172,000
Repurchase Agreement Counterparties, Percentage of total amount outstanding	100.00%		100.00%
Repurchase Agreement Counterparties, Weighted average days to maturity	36 days		18 days
Repurchase Agreement Counterparties, Company RMBS held as collateral	695,421,955		444,984,955
Linked Repurchase Agreements [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	149,293,000
Repurchase Agreement Counterparties, Percentage of total amount outstanding	100.00%
Repurchase Agreement Counterparties, Weighted average days to maturity	25 days		21 days
Repurchase Agreement Counterparties, Company RMBS held as collateral	210,238,657
North America [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	388,138,820	[1]	261,289,000	[2]
Repurchase Agreement Counterparties, Percentage of total amount outstanding	65.25%		63.39%
Repurchase Agreement Counterparties, Weighted average days to maturity	19 days		20 days
Repurchase Agreement Counterparties, Company RMBS held as collateral	463,615,686		277,808,885
North America [Member] | Linked Repurchase Agreements [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	86,985,000		52,871,000
Repurchase Agreement Counterparties, Percentage of total amount outstanding	58.26%		86.42%
Repurchase Agreement Counterparties, Weighted average days to maturity	33 days		21 days
Repurchase Agreement Counterparties, Company RMBS held as collateral	124,620,916		79,528,540
Europe [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	93,350,032	[1],[3]	53,392,000	[2],[3]
Repurchase Agreement Counterparties, Percentage of total amount outstanding	15.69%	[3]	12.96%	[3]
Repurchase Agreement Counterparties, Weighted average days to maturity	21 days	[3]	21 days	[3]
Repurchase Agreement Counterparties, Company RMBS held as collateral	113,286,452	[3]	60,226,443	[3]
Europe [Member] | Linked Repurchase Agreements [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	46,381,000	[3]	3,323,000	[3]
Repurchase Agreement Counterparties, Percentage of total amount outstanding	31.07%	[3]	5.43%	[3]
Repurchase Agreement Counterparties, Weighted average days to maturity	15 days	[3]	43 days	[3]
Repurchase Agreement Counterparties, Company RMBS held as collateral	62,487,229	[3]	6,303,837	[3]
Asia [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	113,389,000	[1],[3]	97,491,000	[2],[3]
Repurchase Agreement Counterparties, Percentage of total amount outstanding	19.06%	[3]	23.65%	[3]
Repurchase Agreement Counterparties, Weighted average days to maturity	122 days	[3]	12 days	[3]
Repurchase Agreement Counterparties, Company RMBS held as collateral	118,519,817	[3]	106,949,627	[3]
Asia [Member] | Linked Repurchase Agreements [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparties, Amount Outstanding	15,927,000	[3]	4,987,000	[3]
Repurchase Agreement Counterparties, Percentage of total amount outstanding	10.67%	[3]	8.15%	[3]
Repurchase Agreement Counterparties, Weighted average days to maturity	9 days	[3]	7 days	[3]
Repurchase Agreement Counterparties, Company RMBS held as collateral	$ 23,130,512	[3]	$ 8,790,416	[3]

[1] At December 31, 2014, the Company had repurchase agreements of $85,497,000 and $63,796,000 that were linked to Non-Agency RMBS and Multi-Family MBS purchases, respectively, and were accounted for as Linked Transactions, and as such, the linked repurchase agreements are not included in the above table. (See Note 3).

[2] At December 31, 2013, the Company had repurchase agreements of $61,181,000 that were linked to Non-Agency RMBS purchases and were accounted for as Linked Transactions, and as such, the linked repurchase agreements are not included in the above table. (See Note 3).

[3] Counterparties domiciled in Europe and Asia, or their U.S. subsidiaries.