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Fair Value - Summary of Reconciliation of the Changes in Fair Value of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  |  | $ 110,874 |  | $ 0 | $ 0 |
Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 350,737 | $ (443,846) | $ (406,749) |  | $ (514,891) | (514,891) |  | (229,160) | (16,676) |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Purchases | 2,084 | 0 | 2,201 |  | 7,700 | 8,464 |  | 570 | 90,129 |
Issuances | (20,468) | 18,114 | (24,061) |  | (6,361) | 33,872 |  | (412,603) | (316,607) |
Transfer from MSRs, at amortized cost |  |  | 839,157 |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  | 110,874 | 110,874 |  |  |  |
Sales | (2,329) | 0 | (71,318) |  | 0 | 0 |  | 24,156 | (405) |
Settlements | 23,303 | (5,112) | 56,745 | [1] | (16,453) | (33,483) | [2] | 85,381 | 15,353 |
Purchases, issuances, sales and settlements, total | 2,590 | 13,002 | 802,724 |  | 95,760 | 119,727 |  | (302,496) | (211,530) |
Total realized and unrealized gains and (losses): |  |  |  |  |  |  |  |  |  |
Included in earnings | (26,089) | 636 | (68,737) | [3] | (11,077) | (11,585) | [4] | 29,128 | 7,361 | [4]
Included in Other comprehensive income | 0 | 0 | 0 | [3] | 0 | 0 | [4] | (12,363) | (8,315) | [4]
Total realized and unrealized gains and (losses) | (26,089) | 636 | (68,737) | [3] | (11,077) | (11,585) | [4] | 16,765 | (954) | [4]
Transfers in and / or out of Level 3 | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Ending balance | 327,238 | (430,208) | 327,238 |  | (430,208) | (406,749) |  | (514,891) | (229,160) |
Loans Held for Investment - Reverse Mortgages [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 2,097,192 | 1,107,626 | 1,550,141 |  | 618,018 | 618,018 |  | 0 | 0 |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Purchases | 0 | 0 | 0 |  | 0 | 0 |  | 10,251 | 0 |
Issuances | 250,600 | 208,566 | 781,002 |  | 565,670 | 816,881 |  | 609,555 | 0 |
Transfer from MSRs, at amortized cost |  |  | 0 |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  | 110,874 | 110,874 |  |  |  |
Sales | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Settlements | (41,582) | (27,592) | (105,505) | [1] | (56,193) | (99,923) | [2] | (5,886) | 0 |
Purchases, issuances, sales and settlements, total | 209,018 | 180,974 | 675,497 |  | 620,351 | 827,832 |  | 613,920 | 0 |
Total realized and unrealized gains and (losses): |  |  |  |  |  |  |  |  |  |
Included in earnings | 13,305 | 26,724 | 93,877 | [3] | 76,955 | 104,291 | [4] | 4,098 | 0 | [4]
Included in Other comprehensive income | 0 | 0 | 0 | [3] | 0 | 0 | [4] | 0 | 0 | [4]
Total realized and unrealized gains and (losses) | 13,305 | 26,724 | 93,877 | [3] | 76,955 | 104,291 | [4] | 4,098 | 0 | [4]
Transfers in and / or out of Level 3 | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Ending balance | 2,319,515 | 1,315,324 | 2,319,515 |  | 1,315,324 | 1,550,141 |  | 618,018 | 0 |
HMBS - Related Borrowings [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | (1,987,998) | (1,033,712) | (1,444,252) |  | (615,576) | (615,576) |  | 0 | 0 |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Purchases | 0 | 0 | 0 |  | 0 | 0 |  | (10,179) | 0 |
Issuances | (271,068) | (190,452) | (803,924) |  | (572,031) | (783,009) |  | (604,991) | 0 |
Transfer from MSRs, at amortized cost |  |  | 0 |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  | 0 | 0 |  |  |  |
Sales | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Settlements | 43,725 | 12,690 | 107,522 | [1] | 25,725 | 47,077 | [2] | 5,440 | 0 |
Purchases, issuances, sales and settlements, total | (227,343) | (177,762) | (696,402) |  | (546,306) | (735,932) |  | (609,730) | 0 |
Total realized and unrealized gains and (losses): |  |  |  |  |  |  |  |  |  |
Included in earnings | (14,263) | (24,620) | (88,950) | [3] | (74,212) | (92,744) | [4] | (5,846) | 0 | [4]
Included in Other comprehensive income | 0 | 0 | 0 | [3] | 0 | 0 | [4] | 0 | 0 | [4]
Total realized and unrealized gains and (losses) | (14,263) | (24,620) | (88,950) | [3] | (74,212) | (92,744) | [4] | (5,846) | 0 | [4]
Transfers in and / or out of Level 3 | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Ending balance | (2,229,604) | (1,236,094) | (2,229,604) |  | (1,236,094) | (1,444,252) |  | (615,576) | 0 |
Mortgage Backed Securities [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 8,157 | 7,502 | 7,335 |  | 0 | 0 |  |  |  |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Purchases | 0 | 0 | 0 |  | 7,677 | 7,677 |  |  |  |
Issuances | 0 | 0 | 0 |  | 0 | 0 |  |  |  |
Transfer from MSRs, at amortized cost |  |  | 0 |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  | 0 | 0 |  |  |  |
Sales | 0 | 0 | 0 |  | 0 | 0 |  |  |  |
Settlements | 0 | 0 | 0 | [1] | 0 | 0 | [2] |  |  |
Purchases, issuances, sales and settlements, total | 0 | 0 | 0 |  | 7,677 | 7,677 |  |  |  |
Total realized and unrealized gains and (losses): |  |  |  |  |  |  |  |  |  |
Included in earnings | 384 | (124) | 1,206 | [3] | (299) | (342) | [4] |  |  |
Included in Other comprehensive income | 0 | 0 | 0 | [3] | 0 | 0 | [4] |  |  |
Total realized and unrealized gains and (losses) | 384 | (124) | 1,206 | [3] | (299) | (342) | [4] |  |  |
Transfers in and / or out of Level 3 | 0 | 0 | 0 |  | 0 | 0 |  |  |  |
Ending balance | 8,541 | 7,378 | 8,541 |  | 7,378 | 7,335 |  | 0 |  |
Financing Liability - MSRs Pledged [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | (581,219) | (629,579) | (614,441) |  | (633,804) | (633,804) |  | (303,705) | 0 |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Purchases | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Issuances | 0 | 0 | 0 |  | 0 | 0 |  | (417,167) | (316,607) |
Transfer from MSRs, at amortized cost |  |  | 0 |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  | 0 | 0 |  |  |  |
Sales | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Settlements | 21,160 | 10,724 | 54,382 | [1] | 14,949 | 19,363 | [2] | 87,068 | 12,902 |
Purchases, issuances, sales and settlements, total | 21,160 | 10,724 | 54,382 |  | 14,949 | 19,363 |  | (330,099) | (303,705) |
Total realized and unrealized gains and (losses): |  |  |  |  |  |  |  |  |  |
Included in earnings | 0 | 0 | 0 | [3] | 0 | 0 | [4] | 0 | 0 | [4]
Included in Other comprehensive income | 0 | 0 | 0 | [3] | 0 | 0 | [4] | 0 | 0 | [4]
Total realized and unrealized gains and (losses) | 0 | 0 | 0 | [3] | 0 | 0 | [4] | 0 | 0 | [4]
Transfers in and / or out of Level 3 | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Ending balance | (560,059) | (618,855) | (560,059) |  | (618,855) | (614,441) |  | (633,804) | (303,705) |
Derivatives [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 155 | 97 | 567 |  | 442 | 442 |  | (10,668) | (16,676) |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Purchases | 2,084 | 0 | 2,201 |  | 23 | 787 |  | 498 | 4,946 |
Issuances | 0 | $ 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Transfer from MSRs, at amortized cost |  |  | 0 |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  | 0 | 0 |  |  |  |
Sales | 0 |  | 0 |  | 0 | 0 |  | 24,156 | (405) |
Settlements | 0 | $ 0 | 346 | [1] | 0 | 0 | [2] | (1,241) | 2,451 |
Purchases, issuances, sales and settlements, total | 2,084 | 0 | 2,547 |  | 23 | 787 |  | 23,413 | 6,992 |
Total realized and unrealized gains and (losses): |  |  |  |  |  |  |  |  |  |
Included in earnings | (738) | (6) | (1,613) | [3] | (374) | (662) | [4] | 60 | 7,331 | [4]
Included in Other comprehensive income | 0 | 0 | 0 | [3] | 0 | 0 | [4] | (12,363) | (8,315) | [4]
Total realized and unrealized gains and (losses) | (738) | (6) | (1,613) | [3] | (374) | (662) | [4] | (12,303) | (984) | [4]
Transfers in and / or out of Level 3 | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Ending balance | 1,501 | 91 | 1,501 |  | 91 | 567 |  | 442 | (10,668) |
Mortgage Servicing Rights [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 814,450 | 104,220 | 93,901 |  | 116,029 | 116,029 |  | 85,213 | 0 |
Purchases, issuances, sales and settlements: |  |  |  |  |  |  |  |  |  |
Purchases | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 85,183 |
Issuances | 0 | 0 | (1,139) |  | 0 | $ 0 |  | 0 | 0 |
Transfer from MSRs, at amortized cost |  |  | 839,157 |  |  |  |  |  |  |
Transfer from Loans held for sale, at fair value |  |  |  |  | 0 |  |  |  |  |
Sales | (2,329) | 0 | (71,318) |  | 0 | $ 0 |  | 0 | 0 |
Settlements | 0 | (934) | 0 | [1] | (934) | 0 | [2] | 0 | 0 |
Purchases, issuances, sales and settlements, total | (2,329) | (934) | 766,700 |  | (934) | 0 |  | 0 | 85,183 |
Total realized and unrealized gains and (losses): |  |  |  |  |  |  |  |  |  |
Included in earnings | (24,777) | (1,338) | (73,257) | [3] | (13,147) | (22,128) | [4] | 30,816 | 30 | [4]
Included in Other comprehensive income | 0 | 0 | 0 | [3] | 0 | 0 | [4] | 0 | 0 | [4]
Total realized and unrealized gains and (losses) | (24,777) | (1,338) | (73,257) | [3] | (13,147) | (22,128) | [4] | 30,816 | 30 | [4]
Transfers in and / or out of Level 3 | 0 | 0 | 0 |  | 0 | 0 |  | 0 | 0 |
Ending balance | $ 787,344 | $ 101,948 | $ 787,344 |  | $ 101,948 | $ 93,901 |  | $ 116,029 | $ 85,213 |
[1] | In the event of a transfer to another party of servicing related to Rights to MSRs, we are required to reimburse New Residential Investment Corp. (NRZ) at predetermined contractual rates for the loss of servicing revenues. Settlements for Financing liability - MSRs pledged for the nine months ended September 30, 2015 includes $2.2 million of such reimbursements.
[2] | In the event of a transfer of servicing to another party related to Rights to MSRs, we are required to reimburse the owner of the Rights to MSRs at predetermined contractual rates for the loss of servicing revenues. Settlements for Financing liability - MSRs pledged for the year ended December 31, 2014 include $2.0 million of such reimbursements.
[3] | Total losses attributable to derivative financial instruments still held at September 30, 2015 were $1.3 million for the nine months ended September 30, 2015.
[4] | Total losses attributable to derivative financial instruments still held at December 31, 2014 and 2012 were $0.7 million and $1.2 million, respectively.

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