Represents the accumulated amortization expenses related to impairment of long-lived and intangible assets.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

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-Subparagraph (c)

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 350

-SubTopic 30

-Section 45

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- Definition

Amount of interest capitalized, including amount of allowance for funds used during construction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829

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-Topic 980

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

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Nature of Operations and Summary of Significant Accounting Policies (Details 4) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 07, 2005
Impairment of Long Lived and Intangible Assets
Property and equipment and related assets	$ 3,021,188,000us-gaap_PropertyPlantAndEquipmentNet	$ 2,651,793,000us-gaap_PropertyPlantAndEquipmentNet
Intangible assets	12,748,000	14,998,000	17,248,000
Capitalized Interest
Capitalized interest costs	1,800,000	1,200,000	0
Atlantic Southeast Airlines Inc
Impairment of Long Lived and Intangible Assets
Intangible assets related to acquisition of Atlantic Southeast				33,700,000
Period for amortization of intangible assets				15 years
Accumulated amortization expense	$ 21,000,000	$ 18,700,000