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Fair Value Measurements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.01 $ 0.01
Non-cash impairment charges $ 8,978    
Impairment and loss on right of use asset $ 17,540 $ 1,999  
Impairment Of Leased Railcars   16,952  
Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, net   $ 11,515  
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.01 $ 0.01
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, net   $ 11,515