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Other assets - Schedule (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
Chile VAT receivable 20,874,000 22,595,000
Investment in Carbon Recycling International 4,620,000 4,620,000
Defined benefit pension plans 5,856,000 5,150,000
Other 20,228,000 18,044,000
Total other assets 90,991,000 135,406,000
Less current portion (8,180,000) (60,931,000)
Other assets $ 82,811,000 $ 74,475,000