Borrowings (Schedule of Debt Repayments) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Expected principal repayments related to consolidated residential mortgage loan securitizations	$ 383,700
Repurchase Agreements
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	1,987,174
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	0
2020 Scheduled Repayment of Principal	47,051
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	0
Total Scheduled Repayment of Principal	2,034,225
Other Secured Borrowings
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	175,036
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	159,148
2020 Scheduled Repayment of Principal	95,917
2021 Scheduled Repayment of Principal	74,180
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	57,319
Total Scheduled Repayment of Principal	561,600
Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	0
2020 Scheduled Repayment of Principal	86,000
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	0
Total Scheduled Repayment of Principal	86,000
Total
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	2,162,210
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	159,148
2020 Scheduled Repayment of Principal	228,968
2021 Scheduled Repayment of Principal	74,180
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	57,319
Total Scheduled Repayment of Principal	$ 2,681,825

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 3
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