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Other assets - Narrative (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]    
Restricted cash and cash equivalents $ 39,413,000 $ 18,545,000
Restricted cash and cash equivalents for vessels under construction 0 66,452,000
Other current assets 8,180,000 $ 60,931,000
Restricted cash, special capital use 3,300,000  
Restricted cash, asset held for sale $ 4,900,000