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Significant Customers (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Concentration Risk [Line Items]        
Accounts receivable     $ 155,115 $ 153,511
Fair Value Adjustment of Warrants $ 6,900 $ 118,000    
Warrant liability     $ 96,536 103,474
DHL [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]        
Concentration Risk [Line Items]        
Percentage of consolidated revenues 14.00% 11.00%    
DHL [Member] | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Accounts receivable $ 11,601     10,471
Amazon [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]        
Concentration Risk [Line Items]        
Percentage of consolidated revenues 35.00% 29.00%    
Amazon [Member] | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Accounts receivable $ 58,132     55,997
US Military [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]        
Concentration Risk [Line Items]        
Percentage of consolidated revenues 22.00% 30.00%    
US Military [Member] | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Accounts receivable $ 31,204     $ 32,625
Amazon Warrant C [Member] [Member]        
Concentration Risk [Line Items]        
Class of Warrant or Right, Outstanding 0      
Warrant liability $ (96,500)      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 21.53      
Class of Warrant or Right, Unissued 14,800      
Amazon Warrant Subsequent [Member]        
Concentration Risk [Line Items]        
Class of Warrant or Right, Outstanding 4,100      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 20.40      
Class of Warrant or Right, Unissued 2,900