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Commitments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Commitments [Line Items] |  |  |
Minimum rental commitments, 2019 | $ 17,808 |  |
Minimum rental commitments, 2020 | 16,674 |  |
Minimum rental commitments, 2021 | 15,787 |  |
Minimum rental commitments, 2022 | 13,971 |  |
Operating leases, rent expense | $ 16,000 | $ 17,900 | $ 20,000
Threshold percentage of outstanding principal balance on maximum claim amount | 98.00% |  |
PHH Corporation [Member] |  |  |
Other Commitments [Line Items] |  |  |
Minimum rental commitments, 2019 | $ 7,700 |  |
Minimum rental commitments, 2020 | 7,100 |  |
Minimum rental commitments, 2021 | 6,900 |  |
Minimum rental commitments, 2022 | 6,600 |  |
Floating Rate Reverse Mortgage Loans [Member] |  |  |
Other Commitments [Line Items] |  |  |
Additional borrowing capacity to borrowers | 1,400,000 |  |
Forward Mortgage Loan Interest Rate Lock Commitments [Member] |  |  |
Other Commitments [Line Items] |  |  |
Short-term commitments to lend | 132,100 |  |
Reverse Mortgage Loan Interest Rate Lock Commitments [Member] |  |  |
Other Commitments [Line Items] |  |  |
Short-term commitments to lend | $ 18,100 |  |

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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