Property and Equipment (Schedule of Property and Equipment) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 1,363,435,000us-gaap_PropertyPlantAndEquipmentGross	$ 1,290,329,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(516,167,000)	(452,157,000)
Property and equipment, net	847,268,000us-gaap_PropertyPlantAndEquipmentNet	838,172,000us-gaap_PropertyPlantAndEquipmentNet
Flight Equipment [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	62,800,000
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	1,285,966,000	1,167,737,000
Operating Leases, Future Minimum Payments Receivable, in Two Years	53,500,000
Operating Leases, Future Minimum Payments Receivable, in Three Years	34,000,000
Operating Leases, Future Minimum Payments Receivable, in Four Years	17,600,000
Operating Leases, Future Minimum Payments Receivable, in Five Years	8,700,000
Ground equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	33,677,000	42,368,000
facilities, leasehold improvements and office equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	25,180,000	11,737,000
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	18,612,000	68,487,000
DHL restated and amendent CMI agreement [Member] \| Flight Equipment [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	61,600,000
Property, Plant and Equipment, Net, by Type [Abstract]
Operating Leases, Future Minimum Payments Receivable, in Two Years	52,000,000
Operating Leases, Future Minimum Payments Receivable, in Three Years	49,700,000
Operating Leases, Future Minimum Payments Receivable, in Four Years	44,900,000
Operating Leases, Future Minimum Payments Receivable, in Five Years	$ 15,900,000

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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