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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