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Financial Instruments (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Hyundai Merchant Marine Co Ltd ("HMM")      
Derivative Instruments Gain/ (Loss) [Line Items]      
Major customer percentage 40.00% 38.00% 38.00%
CMA CGM      
Derivative Instruments Gain/ (Loss) [Line Items]      
Major customer percentage 39.00% 36.00% 36.00%