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Credit Facilities (Japan Lifeline Co., Ltd. Subordinated Promissory Note) (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Nov. 20, 2018
Debt Instrument [Line Items]      
Other debt $ 4,281,000 $ 4,281,000  
Japan Lifeline Co., Ltd.      
Debt Instrument [Line Items]      
Other debt     $ 4,281,000.000
Japan Lifeline Co., Ltd. | Other debt      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate     2.50%