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Borrowings - SBI Bonds (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 JPY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 JPY (¥)	Jul. 25, 2016 USD ($)	Jul. 25, 2016 JPY (¥)
Debt Instrument [Line Items]
Outstanding principal amount	$ 2,031,571
SBI Bonds
Debt Instrument [Line Items]
Outstanding principal amount	31,571			$ 31,908
VFH | SBI Bonds
Debt Instrument [Line Items]
Face amount						$ 33,100	¥ 3,500,000,000.0
Outstanding principal amount	31,600		¥ 3,500,000,000	$ 31,900	¥ 3,500,000,000
Loss due to change in currency rates	$ 400	$ 1,900

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