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Financing and Other Debt - Amounts Outstanding Under Participation Debt Agreements (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Amounts Outstanding $ 2,686,513,000 $ 2,133,923,000
Loan Participations and Assignments    
Debt Instrument [Line Items]    
Amounts Available 80,000,000 180,000,000
Amounts Outstanding 50,000,000 114,849,000
Remaining Funding Capacity $ 30,000,000 $ 65,151,000
Average interest rate 4.17% 4.30%
Loan Participations and Assignments | Short-term debt, net    
Debt Instrument [Line Items]    
Amounts Available $ 80,000,000 $ 130,000,000
Amounts Outstanding 50,000,000 64,849,000
Remaining Funding Capacity 30,000,000 65,151,000
Loan Participations and Assignments | Long-term debt, net    
Debt Instrument [Line Items]    
Amounts Available 0 50,000,000
Amounts Outstanding $ 0 50,000,000
Loan Participations And Assignments One    
Debt Instrument [Line Items]    
Amounts Available   50,000,000
Remaining Funding Capacity   80,000,000
Loan Participations And Assignments Two    
Debt Instrument [Line Items]    
Amounts Available   50,000,000
Amounts Outstanding   $ 14,800,000