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Borrowings - Schedule of Financing Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
HMBS-related borrowings $ 5,903,965 $ 5,380,448
Other financing liabilities 1,069,594 1,127,613
Total Financing liabilities 6,973,559 6,508,061
Financing liability – MSRs pledged [Member]    
Debt Instrument [Line Items]    
Other financing liabilities 986,952 1,032,856
Financing liability – MSRs pledged [Member] | Original Rights to MSRs Agreements [Member]    
Debt Instrument [Line Items]    
Other financing liabilities 627,287 436,511
Financing liability – MSRs pledged [Member] | Two Thousand Seventeen Agreements [Member]    
Debt Instrument [Line Items]    
Other financing liabilities 61,445 138,854
Financing liability – MSRs pledged [Member] | PHH MSR Agreements [Member]    
Debt Instrument [Line Items]    
Other financing liabilities $ 298,220 457,491
OASIS Series 2014-1 [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.00%  
Maturity date Feb. 28, 2028  
Other financing liabilities $ 59,815 65,523
IndyMac Mortgage Loan Trust [Member]    
Debt Instrument [Line Items]    
Other financing liabilities 9,987 11,012
Residential Asset Securitization Trust [Member]    
Debt Instrument [Line Items]    
Other financing liabilities 12,840 13,803
Financing Liability Owed to Securitization Investors [Member]    
Debt Instrument [Line Items]    
Other financing liabilities 22,827 24,815
Financing Liability – Advances Pledged [Member]    
Debt Instrument [Line Items]    
Other financing liabilities $ 0 $ 4,419
London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.02% 2.50%
London Interbank Offered Rate (LIBOR) [Member] | HMBS - Related Borrowings [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.60%