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Significant Customers (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 08, 2016
Dec. 31, 2015
Concentration Risk [Line Items]        
Accounts receivable $ 57,865     $ 57,986
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants $ 7,686      
fair value warrants issued, per share     $ 4.89  
Incentive to Lessee     $ 37,586  
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Warrants Issued 280      
Fair Value of Warrant Liability $ 1,800      
DHL [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]        
Concentration Risk [Line Items]        
Percentage of consolidated revenues 36.00% 52.00%    
DHL [Member] | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Accounts receivable $ 4,600     9,800
Amazon [Member] [Member] | Revenues from Services Performed [Member] | Customer Concentration Risk [Member]        
Concentration Risk [Line Items]        
Percentage of consolidated revenues 19.00%      
Amazon [Member] [Member] | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Accounts receivable $ 17,500     10,500
US Military [Member] | Revenues from Services Performed [Member] | Customer Concentration Risk [Member]        
Concentration Risk [Line Items]        
Percentage of consolidated revenues 15.00% 16.00%    
US Military [Member] | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Accounts receivable $ 7,500     $ 9,700
CAM [Member]        
Concentration Risk [Line Items]        
Incentive to Lessee $ 37,586   $ 37,586