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Fair Value - Schedule of Fair Value Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | --- | --- | ---
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale, at fair value |  | $ 235,909 |  | $ 401,120 |  | $ 335,950 | $ 503,753 |  | $ 426,480 | $ 0
Total Loans held for sale |  | 526,972 |  | 488,612 |  |  | 566,660 |  |  |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
Match funded liabilities |  | 1,589,846 |  | 2,090,247 |  |  | 2,364,814 |  |  |
Financing liabilities: |  |  |  |  |  |  |  |  |  |
HMBS-related borrowings, at fair value |  |  |  | 2,058,693 |  |  | 1,249,380 |  |  |
Long-term debt, gross |  | 2,953,518 |  | 2,258,641 |  |  | 1,266,973 |  |  |
Other secured borrowings: |  |  |  |  |  |  |  |  |  |
Outstanding balance |  | 1,001,070 |  | 1,733,691 |  |  | 1,777,669 |  |  |
Senior unsecured notes |  | 350,000 |  | 350,000 |  |  | 0 |  |  |
MSRs: |  |  |  |  |  |  |  |  |  |
Mortgage servicing rights, at fair value |  | 787,344 |  | 93,901 |  |  | 116,029 |  |  |
Total MSRs |  | 1,153,295 |  | 1,913,992 |  |  | 2,069,381 |  |  |
Carrying Value [Member] |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Total Loans held for sale |  | 526,972 |  | 488,612 |  |  | 566,660 |  |  |
Financing liabilities: |  |  |  |  |  |  |  |  |  |
Total Financing liabilities |  |  |  | 2,258,641 |  |  | 1,266,973 |  |  |
Long-term debt, gross |  | 2,953,518 |  | 2,258,641 |  |  |  |  |  |
Other secured borrowings: |  |  |  |  |  |  |  |  |  |
Outstanding balance |  | 1,001,070 |  | 1,733,691 |  |  |  |  |  |
Total Other secured borrowings |  |  |  | 1,733,691 |  |  | 1,777,669 |  |  |
MSRs: |  |  |  |  |  |  |  |  |  |
Total MSRs |  | 1,153,295 |  | 1,913,992 |  |  | 2,069,381 |  |  |
Fair Value [Member] |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Total Loans held for sale |  | 526,972 |  | 488,612 |  |  | 566,660 |  |  |
Financing liabilities: |  |  |  |  |  |  |  |  |  |
Total Financing liabilities |  |  |  | 2,248,341 |  |  | 1,266,973 |  |  |
Long-term debt, gross |  | 2,934,388 |  | 2,248,341 |  |  |  |  |  |
Other secured borrowings: |  |  |  |  |  |  |  |  |  |
Outstanding balance |  | 1,000,549 |  | 1,658,699 |  |  |  |  |  |
Total Other secured borrowings |  |  |  | 1,658,699 |  |  | 1,762,876 |  |  |
MSRs: |  |  |  |  |  |  |  |  |  |
Total MSRs |  | 1,191,877 |  | 2,331,604 |  |  | 2,557,748 |  |  |
Level 2 [Member] | Carrying Value [Member] |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale, at fair value |  | 235,909 |  | 401,120 | [1],[2] |  | 503,753 | [1] |  |
Other secured borrowings: |  |  |  |  |  |  |  |  |  |
Senior secured term loan | [3] |  |  | 1,273,219 |  |  | 1,284,901 |  |  |
Senior secured term loan |  | 702,918 |  | 1,273,219 | [4] |  |  |  |  |
Senior unsecured notes |  | 350,000 |  | 350,000 | [4] |  |  |  |  |
Senior unsecured notes | [3] |  |  | 350,000 |  |  | 0 |  |  |
Level 2 [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale, at fair value |  | 235,909 | [2] | 401,120 | [1],[2] |  | 503,753 | [1] |  |
Other secured borrowings: |  |  |  |  |  |  |  |  |  |
Senior secured term loan | [3] |  |  | 1,198,227 |  |  | 1,270,108 |  |  |
Senior secured term loan | [4] | 702,397 |  | 1,198,227 |  |  |  |  |  |
Senior unsecured notes | [4] | 321,563 |  | 321,563 |  |  |  |  |  |
Senior unsecured notes | [3] |  |  | 321,563 |  |  | 0 |  |  |
Level 3 [Member] | Carrying Value [Member] |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale, at lower of cost or fair value |  | 291,063 |  | 87,492 | [5],[6] |  | 62,907 | [5] |  |
Loans held for investment - Reverse mortgages, at fair value |  | 2,319,515 |  | 1,550,141 | [1],[2] |  | 618,018 | [1] |  |
Advances and match funded advances |  | 2,472,996 |  | 3,303,356 | [3],[4] |  | 3,443,215 | [3] |  |
Receivables, net |  | 361,572 |  | 270,596 | [3],[4] |  | 152,516 | [3] |  |
Mortgage-backed securities, at fair value |  | 8,541 |  | 7,335 | [1],[2] |  | 0 | [1] |  |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
Match funded liabilities |  | 1,589,846 |  | 2,090,247 | [3],[4] |  | 2,364,814 | [3] |  |
Financing liabilities: |  |  |  |  |  |  |  |  |  |
HMBS-related borrowings, at fair value |  | 2,229,604 |  | 1,444,252 | [1],[2] |  | 615,576 | [1] |  |
Financing liability - MSRs pledged |  | 560,059 |  | 614,441 | [1],[2] |  | 633,804 | [1] |  |
Other |  | 163,855 |  | 199,948 | [3],[4] |  | 17,593 | [3] |  |
Other secured borrowings: |  |  |  |  |  |  |  |  |  |
Other |  | 298,152 |  | 460,472 | [4] |  |  |  |  |
Other | [3] |  |  | 460,472 |  |  | 492,768 |  |  |
MSRs: |  |  |  |  |  |  |  |  |  |
Mortgage servicing rights, at fair value |  | 787,344 |  | 93,901 | [2] |  | 116,029 |  |  |
Amortization method MSRs |  | 365,951 |  | 1,820,091 | [4],[7] |  | 1,953,352 |  |  |
Level 3 [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale, at lower of cost or fair value |  | 291,063 | [6] | 87,492 | [5],[6] |  | 62,907 | [5] |  |
Loans held for investment - Reverse mortgages, at fair value |  | 2,319,515 | [2] | 1,550,141 | [1],[2] |  | 618,018 | [1] |  |
Advances and match funded advances |  | 2,472,996 | [4] | 3,303,356 | [3],[4] |  | 3,443,215 | [3] |  |
Receivables, net |  | 361,572 | [4] | 270,596 | [3],[4] |  | 152,516 | [3] |  |
Mortgage-backed securities, at fair value |  | 8,541 | [2] | 7,335 | [1],[2] |  | 0 | [1] |  |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
Match funded liabilities |  | 1,589,901 | [4] | 2,090,247 | [3],[4] |  | 2,364,814 | [3] |  |
Financing liabilities: |  |  |  |  |  |  |  |  |  |
HMBS-related borrowings, at fair value |  | 2,229,604 | [2] | 1,444,252 | [1],[2] |  | 615,576 | [1] |  |
Financing liability - MSRs pledged |  | 560,059 | [2] | 614,441 | [1],[2] |  | 633,804 | [1] |  |
Other |  | 144,725 | [4] | 189,648 | [3],[4] |  | 17,593 | [3] |  |
Other secured borrowings: |  |  |  |  |  |  |  |  |  |
Other | [4] | 298,152 |  | 460,472 |  |  |  |  |  |
Other | [3] |  |  | 460,472 |  |  | 492,768 |  |  |
MSRs: |  |  |  |  |  |  |  |  |  |
Mortgage servicing rights, at fair value |  | 787,344 | [2] | 93,901 | [2] |  | 116,029 |  |  |
Amortization method MSRs |  | 404,533 |  | 2,237,703 | [4],[7] |  | 2,441,719 |  |  |
Interest Rate Lock Commitments [Member] | Level 2 [Member] | Carrying Value [Member] |  |  |  |  |  |  |  |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |  |  |  |
Interest Rate Lock Commitments (IRLCs) |  | 10,010 |  | 6,065 | [2] |  | 8,433 |  |  |
Interest Rate Lock Commitments [Member] | Level 2 [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |  |  |  |
Interest Rate Lock Commitments (IRLCs) |  | 10,010 | [2] | 6,065 | [2] |  | 8,433 |  |  |
Forward Mortgage Backed Securities Trades [Member] | Level 1 [Member] | Carrying Value [Member] |  |  |  |  |  |  |  |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |  |  |  |
Forward mortgage-backed securities (MBS) trades |  | (3,438) |  | (2,854) | [2] |  | 6,905 |  |  |
Forward Mortgage Backed Securities Trades [Member] | Level 1 [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |  |  |  |
Forward mortgage-backed securities (MBS) trades |  | (3,438) | [2] | (2,854) | [2] |  | 6,905 |  |  |
Interest Rate Cap [Member] | Level 3 [Member] | Carrying Value [Member] |  |  |  |  |  |  |  |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |  |  |  |
Interest rate caps |  | 1,501 |  | 567 | [2] |  | 442 |  |  |
Interest Rate Cap [Member] | Level 3 [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |  |  |  |
Interest rate caps |  | $ 1,501 | [2] | $ 567 | [2] |  | $ 442 |  |  |
[1] | Measured at fair value on a recurring basis.
[2] | Measured at fair value on a recurring basis.
[3] | Disclosed, but not carried, at fair value.
[4] | Disclosed, but not carried, at fair value.
[5] | Measured at fair value on a non-recurring basis.
[6] | Measured at fair value on a non-recurring basis.
[7] | The balance at September 30, 2015 includes our impaired government-insured stratum of amortization method MSRs, which is measured at fair value on a non-recurring basis. The carrying value of this stratum at September 30, 2015 was $144.2 million, net of a valuation allowance of $25.1 million.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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