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Financing and Other Debt - Amounts Outstanding Under Participation Debt Agreements (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Amounts Available $ 768,700,000 $ 768,686,000
Participation debt    
Debt Instrument [Line Items]    
Amounts Outstanding   50,000,000
Remaining Funding Capacity   $ 30,000,000
Average interest rate 3.38% 4.17%
Short-term Debt | Participation debt    
Debt Instrument [Line Items]    
Amounts Available $ 80,000,000 $ 80,000,000
Amounts Outstanding 0 50,000,000
Remaining Funding Capacity $ 80,000,000 $ 30,000,000