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Mortgage Servicing Rights | 12 Months Ended
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Dec. 31, 2017
Transfers and Servicing [Abstract] |
Mortgage Servicing Rights | Mortgage Servicing Rights We invest in mortgage servicing rights associated with residential mortgage loans and contract with licensed sub-servicers 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 December 31, 2017 and December 31, 2016. Table 8.1 – Fair Value of MSRs and Aggregate Principal Amounts of Associated Loans
|  | December 31, 2017 |  | December 31, 2016
(In Thousands) |  | MSR Fair Value |  | Associated Principal |  | MSR Fair Value |  | Associated Principal
Mortgage Servicing Rights |  |  |  |  |  |  |  |
Conforming Loans |  | $ | 1,194 |  |  | $ | 107,416 |  |  | $ | 58,523 |  |  | $ | 4,989,720 |
Jumbo Loans |  | 62,404 |  |  | 5,449,239 |  |  | 60,003 |  |  | 5,467,169 |
Total Mortgage Servicing Rights |  | $ | 63,598 |  |  | $ | 5,556,655 |  |  | $ | 118,526 |  |  | $ | 10,456,889 |
The following table presents activity for MSRs for the years ended December 31, 2017, 2016, and 2015. Table 8.2 – Activity for MSRs
|  | Years Ended December 31,
(In Thousands) |  | 2017 |  | 2016 |  | 2015
Balance at beginning of period |  | $ | 118,526 |  |  | $ | 191,976 |  |  | $ | 139,293 |
Additions |  | 8,026 |  |  | 25,362 |  |  | 95,281 |
Sales |  | (52,788 | ) |  | (62,440 | ) |  | (18,206 | )
Changes in fair value due to: |  |  |  |  |  |
Changes in assumptions (1) |  | (1,088 | ) |  | (14,512 | ) |  | (5,453 | )
Other changes (2) |  | (9,078 | ) |  | (21,860 | ) |  | (18,939 | )
Balance at End of Period |  | $ | 63,598 |  |  | $ | 118,526 |  |  | $ | 191,976 |
(1) | Primarily reflects changes in prepayment assumptions due to changes in market interest rates.
(2) | Represents changes due to the realization of expected cash flows.
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 our taxable REIT subsidiary. The following table details the retention and purchase of MSRs during the years ended December 31, 2017 and 2016. Table 8.3 – MSR Additions
|  | Years Ended December 31,
|  | 2017 |  | 2016
(In Thousands) |  | MSR Fair Value |  | Associated Principal |  | MSR Fair Value |  | Associated Principal
Jumbo MSR additions: |  |  |  |  |  |  |  |
From securitization |  | $ | 7,123 |  |  | $ | 654,605 |  |  | $ | 6,451 |  |  | $ | 939,861 |
From loan sales |  | 263 |  |  | 31,658 |  |  | 177 |  |  | 26,844 |
Total jumbo MSR additions |  | 7,386 |  |  | 686,263 |  |  | 6,628 |  |  | 966,705 |
Conforming MSR additions: |  |  |  |  |  |  |  |
From loan sales |  | — |  |  | — |  |  | 3,380 |  |  | 316,290 |
From purchases |  | 640 |  |  | 106,108 |  |  | 15,354 |  |  | 1,643,577 |
Total conforming MSR additions |  | 640 |  |  | 106,108 |  |  | 18,734 |  |  | 1,959,867 |
Total MSR Additions |  | $ | 8,026 |  |  | $ | 792,371 |  |  | $ | 25,362 |  |  | $ | 2,926,572 |
The following table presents the components of our MSR income for the years ended December 31, 2017, 2016, and 2015. Table 8.4 – Components of MSR Income (Loss), net
|  | Years Ended December 31,
(In Thousands) |  | 2017 |  | 2016 |  | 2015
Servicing income |  | $ | 21,120 |  |  | $ | 41,152 |  |  | $ | 38,964 |
Cost of sub-servicer |  | (2,828 | ) |  | (6,281 | ) |  | (5,079 | )
Net servicing fee income |  | 18,292 |  |  | 34,871 |  |  | 33,885 |
Market valuation changes of MSRs |  | (10,166 | ) |  | (36,372 | ) |  | (24,392 | )
Market valuation changes of associated derivatives (1) |  | (568 | ) |  | 15,584 |  |  | (12,708 | )
MSR reversal of provision for repurchases |  | 302 |  |  | 270 |  |  | (707 | )
MSR Income (Loss), Net |  | $ | 7,860 |  |  | $ | 14,353 |  |  | $ | (3,922 | )
(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.

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