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gain (loss) on stock warrants, pretax

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The number of warrants issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Significant Customers (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	May 12, 2016	Mar. 08, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Accounts receivable	$ 66,285			$ 66,285					$ 57,986
fair value warrants issued, per share	$ 6.71			$ 6.71		$ 5.81		$ 4.89
Adjustments to Additional Paid in Capital, Warrant Issued		$ 7,686		$ 9,833
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Warrants Issued		280
gain (loss) on stock warrants, pretax	$ (8,849)			$ (3,504)
DHL [Member] \| Revenues from Leases and Contracted Services [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues	34.00%		47.00%	35.00%	49.00%
DHL [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 5,000			$ 5,000					9,800
Amazon [Member] [Member] \| Revenues from Services Performed [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues	31.00%			24.00%
Amazon [Member] [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 18,200			$ 18,200					10,500
US Military [Member] \| Revenues from Services Performed [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues	12.00%		17.00%	13.00%	17.00%
US Military [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 8,300			$ 8,300					9,700
CAM [Member]
Concentration Risk [Line Items]
Incentive to Lessee	$ 48,978	$ 37,586		$ 48,978		$ 50,410	$ 13,758	$ 37,586	$ 0