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Freight Tax and Other Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jan. 01, 2019
Sep. 30, 2018
Jan. 01, 2018
Income Tax Contingency [Line Items]            
Unrecognized Tax Benefits $ 35,749 $ 35,749   $ 49,579 $ 35,792 $ 32,059
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions   (14,507) $ (2,047)      
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations   (812) 0      
Tax Adjustments, Settlements, and Unusual Provisions 15,200          
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions   1,489 $ 1,686      
Settlement with Taxing Authority [Member]            
Income Tax Contingency [Line Items]            
Taxes Payable, Current $ 8,600 $ 8,600