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Borrowings - SBI Bonds (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2019
JPY (¥)
Jul. 25, 2016
USD ($)
Jul. 25, 2016
JPY (¥)
Debt Instrument [Line Items]              
Outstanding principal amount $ 1,670,410,000            
SBI Bonds              
Debt Instrument [Line Items]              
Outstanding principal amount 33,898,000 $ 32,225,000          
VFH | SBI Bonds              
Debt Instrument [Line Items]              
Face amount           $ 33,100,000 ¥ 3,500,000,000
Outstanding principal amount 33,900,000 32,200,000   ¥ 3,500,000,000 ¥ 3,500,000,000    
Gain (loss) due to change in currency rates $ (1,700,000) $ (300,000) $ (800,000)