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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt securities: |  |  |
Interest expense | $ 275,041 | $ 363,238 | $ 412,583
Financing Liabilities [Member] |  |  |
Debt securities: |  |  |
Interest expense | 176,683 | 242,514 | 248,834
Financing Liabilities [Member] | NRZ [Member] |  |  |
Debt securities: |  |  |
Interest expense | 171,670 | 236,311 | 234,401
Financing Liabilities [Member] | Other Financing Liabilities With Unrelated Parties [Member] |  |  |
Debt securities: |  |  |
Interest expense | 5,013 | 6,203 | 14,433
Match Funded Liabilties [Member] |  |  |
Debt securities: |  |  |
Interest expense | 31,870 | 47,624 | 66,879
Senior Notes [Member] |  |  |
Debt securities: |  |  |
Interest expense | 31,280 | 29,806 | 30,012
Other Secured Borrowings [Member] |  |  |
Debt securities: |  |  |
Interest expense | 30,465 | 39,531 | 60,469
Other [Member] |  |  |
Debt securities: |  |  |
Interest expense | $ 4,743 | $ 3,763 | $ 6,389

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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