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DEBT OBLIGATIONS - Schedule of Uncommitted Securities Repurchase Facilities (Details)
 6 Months Ended 12 Months Ended
Jun. 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 $ 1,056,380,000 $ 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 1,300,000,000 1,150,000,000 $ 450,000,000 $ 450,000,000 $ 300,000,000
Outstanding Amount 518,170,000 509,023,000      
Committed but Unfunded 781,830,000 640,977,000      
Carrying Amount of Collateral 825,734,000 801,961,000      
Fair Value of collateral 829,591,000 806,014,000      
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 1,600,000,000 1,450,000,000      
Outstanding Amount 1,056,380,000 1,431,665,000      
Committed but Unfunded 957,628,000 766,124,000      
Carrying Amount of Collateral 1,514,262,000 1,878,034,000      
Fair Value of collateral 1,518,119,000 1,882,087,000      
Total Debt Obligations          
Assets Sold under Agreements to Repurchase [Line Items]          
Committed amount on master repurchase agreement 4,566,633,000 3,969,160,000      
Outstanding Amount 3,477,227,000 3,572,825,000      
Committed but Unfunded 1,503,414,000 1,144,124,000      
Carrying Amount of Collateral 4,722,633,000 4,593,410,000      
Fair Value of collateral 4,801,258,000 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 450,000,000 450,000,000      
Outstanding Amount 172,279,000 147,796,000      
Committed but Unfunded 277,721,000 302,204,000      
Carrying Amount of Collateral 245,103,000 278,530,000      
Fair Value of collateral $ 245,577,000 $ 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 121,984,000 138,711,000      
Committed but Unfunded 278,016,000 111,289,000      
Carrying Amount of Collateral 204,042,000 144,858,000      
Fair Value of collateral $ 204,843,000 $ 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 223,907,000        
Committed but Unfunded 226,093,000        
Carrying Amount of Collateral 376,589,000        
Fair Value of collateral $ 379,171,000        
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 124,202,000        
Committed but Unfunded 175,798,000        
Carrying Amount of Collateral 203,876,000        
Fair Value of collateral 203,876,000        
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 414,008,000 747,789,000      
Carrying Amount of Collateral 484,652,000 861,456,000      
Fair Value of collateral 484,652,000 861,456,000      
Maturing on Various Date | Mortgage loan financing          
Assets Sold under Agreements to Repurchase [Line Items]          
Committed amount on master repurchase agreement 529,097,045 447,409,690      
Outstanding Amount 529,097,000 447,410,000      
Committed but Unfunded 0 0      
Carrying Amount of Collateral 690,969,000 591,613,000      
Fair Value of collateral 755,462,000 637,271,000      
Maturing on Various Date | FHLB Financing          
Assets Sold under Agreements to Repurchase [Line Items]          
Committed amount on master repurchase agreement 2,265,786,018 1,900,000,000      
Outstanding Amount 1,758,000,000 1,611,000,000      
Committed but Unfunded 507,786,000 289,000,000      
Carrying Amount of Collateral 2,441,194,000 2,068,988,000      
Fair Value of collateral 2,450,305,000 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 12,000,000 11,000,000      
Committed but Unfunded $ 38,000,000 $ 39,000,000      
Interest Rate(s) (as a percent) 2.94% 2.91%      
Carrying Amount of Collateral $ 21,286,000 $ 0      
Fair Value of collateral 22,372,000 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 46,750,000      
Outstanding Amount 46,750,000 46,750,000      
Committed but Unfunded $ 0 $ 0      
Interest Rate(s) (as a percent) 2.04% 2.01%      
Carrying Amount of Collateral $ 54,922,000 $ 54,775,000      
Fair Value of collateral $ 55,000,000 $ 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 75,000,000 25,000,000      
Committed but Unfunded $ 0 $ 50,000,000      
Interest Rate(s) (as a percent) 3.69%        
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) 1.94% 2.42%      
Minimum | 4/10/2016 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent) 2.44% 2.41%      
Minimum | 5/24/2016 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent) 2.44%        
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 | 5/26/2015 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent)   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% 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) 0.25% 0.30%      
Minimum | 2/11/2017 | Revolving credit facility          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent)   3.66%      
Maximum | 10/30/2016 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent) 2.69% 2.66%      
Maximum | 4/10/2016 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent) 3.44% 3.04%      
Maximum | 5/24/2016 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent) 3.19%        
Maximum | 10/31/2016 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent) 1.28%        
Maximum | 5/26/2015 | Committed master repurchase agreements          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent)   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) 1.68% 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 | 2/11/2017 | Revolving credit facility          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest Rate(s) (as a percent)   5.75%