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Mortgage Servicing Rights | 6 Months Ended
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Jun. 30, 2015
Transfers and Servicing [Abstract] |
Mortgage Servicing Rights | Mortgage Servicing Rights We invest in mortgage servicing rights associated with residential mortgage loans and contract with a licensed sub-servicer to perform all servicing functions for these loans. The following table presents the fair value of MSRs and the aggregate principal amounts of associated loans as of June 30, 2015 and December 31, 2014.
|  | June 30, 2015 |  | December 31, 2014
(In Thousands) |  | MSR Fair Value |  | Associated Principal |  | MSR Fair Value |  | Associated Principal
Mortgage Servicing Rights |  |  |  |  |  |  |  |
Conforming Loans |  | $ | 101,458 |  |  | $ | 8,917,808 |  |  | $ | 81,301 |  |  | $ | 7,705,146 |
Jumbo Loans |  | 67,004 |  |  | 6,148,268 |  |  | 57,992 |  |  | 5,962,784 |
Total Mortgage Servicing Rights |  | $ | 168,462 |  |  | $ | 15,066,076 |  |  | $ | 139,293 |  |  | $ | 13,667,930 |
MSR Activity The following table presents activity for MSRs for the three and six months ended June 30, 2015 and 2014.
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In Thousands) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Balance at beginning of period |  | $ | 120,324 |  |  | $ | 64,971 |  |  | $ | 139,293 |  |  | $ | 64,824 |
Additions |  | 32,463 |  |  | 11,807 |  |  | 51,217 |  |  | 14,666 |
Sales |  | — |  |  | — |  |  | (18,206 | ) |  | — |
Changes in fair value due to: |  |  |  |  |  |  |  |
Changes in assumptions (1) |  | 19,168 |  |  | (3,553 | ) |  | 5,132 |  |  | (4,678 | )
Other changes (2) |  | (3,493 | ) |  | (2,000 | ) |  | (8,974 | ) |  | (3,587 | )
Balance at End of Period |  | $ | 168,462 |  |  | $ | 71,225 |  |  | $ | 168,462 |  |  | $ | 71,225 |
(1) | Primarily reflects changes in prepayment assumptions due to changes in market interest rates.
(2) | Represents changes due to realization of expected cash flows.
MSR Additions We make investments in MSRs through the retention of servicing rights associated with the residential mortgage loans that we acquire and subsequently transfer to third parties or through the direct acquisition of MSRs sold by third parties. We hold our MSR investments at a taxable REIT subsidiary. The following table details the retention and purchase of MSRs during the three and six months ended June 30, 2015.
(In Thousands) |  | Three Months Ended June 30, 2015 |  | Six Months Ended June 30, 2015
|  | MSR Fair Value |  | Associated Principal |  | MSR Fair Value |  | Associated Principal
Jumbo MSR additions: |  |  |  |  |  |  |  |
From securitization |  | $ | 6,002 |  |  | $ | 607,402 |  |  | $ | 7,874 |  |  | $ | 835,254 |
From loan sales |  | 172 |  |  | 16,122 |  |  | 264 |  |  | 26,267 |
Total jumbo MSR additions |  | 6,174 |  |  | 623,524 |  |  | 8,138 |  |  | 861,521 |
Conforming MSR additions: |  |  |  |  |  |  |  |
From loan sales |  | $ | 14,990 |  |  | $ | 1,348,871 |  |  | $ | 28,701 |  |  | $ | 2,701,529 |
From purchases |  | 11,299 |  |  | 1,025,576 |  |  | 14,378 |  |  | 1,343,914 |
Total conforming MSR additions |  | 26,289 |  |  | 2,374,447 |  |  | 43,079 |  |  | 4,045,443 |
Total MSR additions |  | $ | 32,463 |  |  | $ | 2,997,971 |  |  | $ | 51,217 |  |  | $ | 4,906,964 |
MSR Income (Loss), net The following table presents the components of our MSR income.
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In Thousands) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Servicing income |  |  |  |  |  |  |  |
Income |  | $ | 8,454 |  |  | $ | 4,064 |  |  | $ | 18,170 |  |  | $ | 7,697 |
Cost of sub-servicer |  | (1,162 | ) |  | (288 | ) |  | (2,391 | ) |  | (603 | )
Net servicing income |  | 7,292 |  |  | 3,776 |  |  | 15,779 |  |  | 7,094 |
Market valuation changes of MSRs |  | 15,675 |  |  | (5,553 | ) |  | (3,842 | ) |  | (8,265 | )
Market valuation changes of associated derivatives (1) |  | (21,814 | ) |  | — |  |  | (21,814 | ) |  | — |
MSR provision for repurchases |  | (323 | ) |  | — |  |  | (217 | ) |  | — |
MSR income (loss), net |  | $ | 830 |  |  | $ | (1,777 | ) |  | $ | (10,094 | ) |  | $ | (1,171 | )
(1) | In the second quarter of 2015, we began to identify specific derivatives used to hedge the exposure of our MSRs to changes in market interest rates. See Note 2 for additional detail.

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