Borrowings - Schedule of Aggregate Long-term Borrowings (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
2021	$ 948,972
2022	973,171
2023	0
2024	0
2025	0
Thereafter	47,476
Long-term debt, gross	1,969,619
Fair value	1,946,088
Match Funded Liabilities
Debt Instrument [Line Items]
2021	106,288
2022	475,000
2023	0
2024	0
2025	0
Thereafter	0
Long-term debt, gross	581,288
Fair value	581,997
Secured Debt
Debt Instrument [Line Items]
2021	821,141
2022	206,662
2023	0
2024	0
2025	0
Thereafter	47,476
Long-term debt, gross	1,075,279
Fair value	1,043,212
Senior Notes
Debt Instrument [Line Items]
2021	21,543
2022	291,509
2023	0
2024	0
2025	0
Thereafter	0
Long-term debt, gross	313,052
Fair value	$ 320,879

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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