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Mezzanine Equity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2019
JPY (¥)
shares
Dec. 31, 2018
JPY (¥)
Temporary Equity [Line Items]        
Mezzanine equity $ 17,200 $ 16,998    
Series A Cumulative Redeemable Perpetual Preferred Stock        
Temporary Equity [Line Items]        
Mezzanine equity shares issued (in shares) | shares 100   100  
Mezzanine equity $ 17,072 16,875   ¥ 1,854,900,000
Mezzanine dividends $ 128 $ 123    
Preferred stock, dividend rate 2.95%      
Liquidation value of mezzanine equity $ 17,200   ¥ 1,868,692,325