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Significant Customers (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Concentration Risk [Line Items]      
Accounts receivable $ 216,664   $ 205,399
Fair Value Adjustment of Warrants (100) $ 6,900  
Warrant liability $ 989   915
DHL [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Percentage of consolidated revenues 11.00% 14.00%  
DHL [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 11,350   9,111
Amazon [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Percentage of consolidated revenues 34.00% 35.00%  
Amazon [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 82,648   68,429
US Military [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Percentage of consolidated revenues 28.00% 22.00%  
US Military [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 59,130   57,998
Amazon Warrant C [Member] [Member]      
Concentration Risk [Line Items]      
Class of Warrant or Right, Outstanding 14,800    
Warrant liability $ (1,000)   (900)
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 21.53    
Class of Warrant or Right, Unissued 0    
Amazon Warrant Subsequent [Member]      
Concentration Risk [Line Items]      
Class of Warrant or Right, Outstanding 7,000    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 20.40    
Class of Warrant or Right, Unissued 0    
Amazon C Warrants      
Concentration Risk [Line Items]      
reclassification of liability to equity     $ 82,400