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Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
AW139 Medium Helicopter [Member]
helicopter
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Sep. 30, 2014
Construction in Progress [Member]
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Dec. 31, 2013
Construction in Progress [Member]
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Jul. 24, 2014
Lake Palma, S.L. [Member]
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Sep. 30, 2014
Lake Palma, S.L. [Member]
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Jul. 24, 2014
Lake Palma, S.L. [Member]
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| Property, Plant and Equipment [Line Items] | ||||||||||
| Capital expenditures | $ 63,966,000 | $ 48,223,000 | ||||||||
| Capitalized interest payments | 1,000,000 | 200,000 | 3,000,000 | 600,000 | ||||||
| Interest capitalized in property and equipment | 3,300,000 | 1,400,000 | ||||||||
| Number of acquisitions | 4 | |||||||||
| Proceeds from disposition of property and equipment | 10,200,000 | 7,020,000 | 59,976,000 | |||||||
| Gains on asset dispositions, net | 42,000 | 2,560,000 | 6,072,000 | 17,837,000 | ||||||
| Ownership percentage | 51.00% | |||||||||
| Sales price of equity method investment | 9,300,000 | |||||||||
| Gain on sale of equity method investment | 1,500,000 | |||||||||
| Debt obligation | $ 2,900,000 | |||||||||