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Freight Tax and Other Tax Expense (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jan. 01, 2019
Jan. 01, 2018
Income Tax Contingency [Line Items]            
Unrecognized Tax Benefits     $ 29,384 $ 36,240 $ 49,579 $ 32,059
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions       (2,114)    
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations     (961) 0    
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions     2,290 2,067    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions     12,968      
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities   $ 15,200 $ 8,556 $ 0    
Settlement with Taxing Authority [Member]            
Income Tax Contingency [Line Items]            
Payments for Other Taxes $ 7,700