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Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
Construction in Progress [Member]
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Dec. 31, 2013
Construction in Progress [Member]
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May 31, 2014
AW139 Medium Helicopter [Member]
helicopter
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Jun. 30, 2014
AW139 Medium Helicopter [Member]
helicopter
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Mar. 31, 2014
Medium Helicopter [Member]
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May 31, 2014
Medium Helicopter [Member]
helicopter
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Jun. 30, 2014
Medium Helicopter [Member]
helicopter
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| Property, Plant and Equipment [Line Items] | |||||||||||
| Capital expenditures | $ 52,133,000 | $ 30,643,000 | |||||||||
| Capitalized interest payments | 1,100,000 | 200,000 | 2,100,000 | 400,000 | |||||||
| Interest capitalized in property and equipment | 2,700,000 | 1,400,000 | |||||||||
| Number of helicopters delivered | 1 | ||||||||||
| Number of acquisitions | 3 | ||||||||||
| Number of disposals | 2 | 3 | |||||||||
| Proceeds from disposition of property and equipment | 3,400,000 | 18,100,000 | 6,978,000 | 38,492,000 | 3,000,000 | 6,400,000 | |||||
| Gains on asset dispositions, net | $ 3,139,000 | $ 4,476,000 | $ 6,030,000 | $ 15,277,000 | |||||||