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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)

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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