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DEBT OBLIGATIONS - Schedule of Uncommitted Securities Repurchase Facilities (Details) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) period | Dec. 31, 2014 USD ($) period | Oct. 30, 2014 USD ($) | Apr. 29, 2014 USD ($) | Apr. 28, 2014 USD ($)
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Outstanding Amount | $ 1,191,326,000 | $ 1,431,666,000 |  |  |
Carrying Amount of Collateral | 0 | 0 |  |  |
Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 1,450,000,000 | 1,150,000,000 | $ 450,000,000 | $ 450,000,000 | $ 300,000,000
Outstanding Amount | 624,011,000 | 509,023,000 |  |  |
Committed but Unfunded | 825,989,000 | 640,977,000 |  |  |
Carrying Amount of Collateral | 1,075,554,000 | 801,961,000 |  |  |
Fair Value of Collateral | 1,083,081,000 | 806,014,000 |  |  |
Term master repurchase agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 300,000,000 |  |  |  |
Master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 1,750,000,000 | 1,450,000,000 |  |  |
Outstanding Amount | 1,191,326,000 | 1,431,665,000 |  |  |
Committed but Unfunded | 964,460,000 | 766,124,000 |  |  |
Carrying Amount of Collateral | 1,748,495,000 | 1,878,034,000 |  |  |
Fair Value of Collateral | 1,756,022,000 | 1,882,087,000 |  |  |
Total Debt Obligations |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 4,679,498,000 | 3,969,160,000 |  |  |
Outstanding Amount | 3,603,512,000 | 3,572,825,000 |  |  |
Committed but Unfunded | 1,481,772,000 | 1,144,124,000 |  |  |
Carrying Amount of Collateral | 4,744,214,000 | 4,593,410,000 |  |  |
Fair Value of Collateral | 4,834,476,000 | 4,648,313,000 |  |  |
10/30/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 600,000,000 | 450,000,000 |  |  |
Outstanding Amount | 218,516,000 | 147,796,000 |  |  |
Committed but Unfunded | 381,484,000 | 302,204,000 |  |  |
Carrying Amount of Collateral | 323,137,000 | 278,530,000 |  |  |
Fair Value of Collateral | $ 325,108,000 | $ 279,921,000 |  |  |
Remaining Extension Options | period | 2 | 2 |  |  |
Length of extension options | 12 months | 12 months |  |  |
4/10/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | $ 400,000,000 | $ 250,000,000 |  |  |
Outstanding Amount | 128,955,000 | 138,711,000 |  |  |
Committed but Unfunded | 271,045,000 | 111,289,000 |  |  |
Carrying Amount of Collateral | 253,930,000 | 144,858,000 |  |  |
Fair Value of Collateral | $ 255,235,000 | $ 145,749,000 |  |  |
Remaining Extension Options | period | 3 | 1 |  |  |
Length of extension options | 364 days | 364 days |  |  |
5/24/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | $ 450,000,000 |  |  |  |
Outstanding Amount | 276,540,000 |  |  |  |
Committed but Unfunded | 173,460,000 |  |  |  |
Carrying Amount of Collateral | 498,487,000 |  |  |  |
Fair Value of Collateral | $ 502,738,000 |  |  |  |
Remaining Extension Options | period | 2 |  |  |  |
Length of extension options | 12 months |  |  |  |
10/31/2016 | Term master repurchase agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | $ 300,000,000 |  |  |  |
Outstanding Amount | 161,529,000 |  |  |  |
Committed but Unfunded | 138,471,000 |  |  |  |
Carrying Amount of Collateral | 193,271,000 |  |  |  |
Fair Value of Collateral | 193,271,000 |  |  |  |
10/2015 | Uncommitted securities repurchase facilities |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Outstanding Amount | 405,786,000 |  |  |  |
Carrying Amount of Collateral | 479,670,000 |  |  |  |
Fair Value of Collateral | 479,670,000 |  |  |  |
5/26/2015 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement |  | $ 450,000,000 |  |  |
Outstanding Amount |  | 222,516,000 |  |  |
Committed but Unfunded |  | 227,484,000 |  |  |
Carrying Amount of Collateral |  | 378,573,000 |  |  |
Fair Value of Collateral |  | $ 380,344,000 |  |  |
Remaining Extension Options | period |  | 2 |  |  |
Length of extension options |  | 12 months |  |  |
4/30/2015 | Term master repurchase agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement |  | $ 300,000,000 |  |  |
Outstanding Amount |  | 174,853,000 |  |  |
Committed but Unfunded |  | 125,147,000 |  |  |
Carrying Amount of Collateral |  | 214,617,000 |  |  |
Fair Value of Collateral |  | 214,617,000 |  |  |
Maturing on Various Date | Uncommitted securities repurchase facilities |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Outstanding Amount |  | 747,789,000 |  |  |
Carrying Amount of Collateral |  | 861,456,000 |  |  |
Fair Value of Collateral |  | 861,456,000 |  |  |
Maturing on Various Date | Mortgage loan financing |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 555,785,756 | 447,409,690 |  |  |
Outstanding Amount | 555,786,000 | 447,410,000 |  |  |
Committed but Unfunded | 0 | 0 |  |  |
Carrying Amount of Collateral | 723,407,000 | 591,613,000 |  |  |
Fair Value of Collateral | 796,740,000 | 637,271,000 |  |  |
Maturing on Various Date | FHLB Financing |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 2,248,711,953 | 1,900,000,000 |  |  |
Outstanding Amount | 1,786,000,000 | 1,611,000,000 |  |  |
Committed but Unfunded | 462,712,000 | 289,000,000 |  |  |
Carrying Amount of Collateral | 2,250,547,000 | 2,068,988,000 |  |  |
Fair Value of Collateral | 2,258,794,000 | 2,073,955,000 |  |  |
1/24/2016 | Borrowings under credit agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | 50,000,000 | 50,000,000 |  |  |
Outstanding Amount | 20,400,000 | 11,000,000 |  |  |
Committed but Unfunded | 29,600,000 | $ 39,000,000 |  |  |
Interest Rate(s) (as a percent) |  | 2.91% |  |  |
Carrying Amount of Collateral | 21,765,000 | $ 0 |  |  |
Fair Value of Collateral | $ 22,920,000 | 0 |  |  |
10/6/2015 | Credit and Security Agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement |  | 46,750,000 |  |  |
Outstanding Amount |  | 46,750,000 |  |  |
Committed but Unfunded |  | $ 0 |  |  |
Interest Rate(s) (as a percent) |  | 2.01% |  |  |
Carrying Amount of Collateral |  | $ 54,775,000 |  |  |
Fair Value of Collateral |  | $ 55,000,000 |  |  |
Remaining Extension Options | period | 1 | 1 |  |  |
Length of extension options | 12 months | 12 months |  |  |
2/11/2017 | Revolving credit facility |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Committed amount on master repurchase agreement | $ 75,000,000 | $ 75,000,000 |  |  |
Outstanding Amount | 50,000,000 | 25,000,000 |  |  |
Committed but Unfunded | $ 25,000,000 | $ 50,000,000 |  |  |
Remaining Extension Options | period | 2 | 2 |  |  |
Length of extension options | 12 months | 12 months |  |  |
Minimum | 10/30/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 1.96% | 2.42% |  |  |
Minimum | 4/10/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 2.45% | 2.41% |  |  |
Minimum | 5/24/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 2.45% |  |  |  |
Minimum | 10/31/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 0.88% |  |  |  |
Minimum | 10/2015 | Uncommitted securities repurchase facilities |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 0.50% |  |  |  |
Minimum | 5/26/2015 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 2.45% | 2.42% |  |  |
Minimum | 4/30/2015 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) |  | 0.87% |  |  |
Minimum | Maturing on Various Date | Uncommitted securities repurchase facilities |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) |  | 0.50% |  |  |
Minimum | Maturing on Various Date | Mortgage loan financing |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 4.25% | 4.25% |  |  |
Minimum | Maturing on Various Date | FHLB Financing |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 0.27% | 0.30% |  |  |
Minimum | 1/24/2016 | Borrowings under credit agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 2.94% |  |  |  |
Minimum | 2/11/2017 | Revolving credit facility |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 3.69% | 3.66% |  |  |
Maximum | 10/30/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 2.71% | 2.66% |  |  |
Maximum | 4/10/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 4.21% | 3.04% |  |  |
Maximum | 5/24/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 4.21% |  |  |  |
Maximum | 10/31/2016 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 1.30% |  |  |  |
Maximum | 10/2015 | Uncommitted securities repurchase facilities |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 1.82% |  |  |  |
Maximum | 5/26/2015 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 4.21% | 3.16% |  |  |
Maximum | 4/30/2015 | Committed master repurchase agreements |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) |  | 1.27% |  |  |
Maximum | Maturing on Various Date | Uncommitted securities repurchase facilities |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) |  | 1.66% |  |  |
Maximum | Maturing on Various Date | Mortgage loan financing |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 6.75% | 6.75% |  |  |
Maximum | Maturing on Various Date | FHLB Financing |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 2.74% | 2.74% |  |  |
Maximum | 1/24/2016 | Borrowings under credit agreement |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 2.96% |  |  |  |
Maximum | 2/11/2017 | Revolving credit facility |  |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |  |
Interest Rate(s) (as a percent) | 5.75% | 5.75% |  |  |

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