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Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Narrative) (Details) (USD $)
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1 Months Ended | 3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2014
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Mar. 31, 2013
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| Property, Plant and Equipment [Line Items] | |||
| Capital expenditures | $ 18,751,000 | $ 19,445,000 | |
| Proceeds from disposition of property and equipment | 3,000,000 | 3,566,000 | 19,099,000 |
| Gain on sale | $ 2,900,000 | ||
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AW139 Medium Helicopter [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Number of helicopters delivered | 1 | ||
| Number of acquisitions | 2 | ||
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Medium Helicopter [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Number of disposals | 2 | ||
| X | ||||||||||
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- Definition
Number of Helicopters Delivered No definition available.
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- Definition
Significant Acquisitions and Disposals, Number of Acquisitions No definition available.
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| X | ||||||||||
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- Definition
Significant Acquisitions and Disposals, Number of Disposals No definition available.
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- Definition
Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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