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Nature of Operations and Summary of Significant Accounting Policies (Details 4) (USD $) | 12 Months Ended | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2005 Atlantic Southeast Airlines,Inc. Y | Dec. 31, 2012 Atlantic Southeast Airlines,Inc. | Dec. 31, 2011 Atlantic Southeast Airlines,Inc. | Sep. 07, 2005 Atlantic Southeast Airlines,Inc.
Impairment of Long Lived and Intangible Assets |  |  |  |  |  |  |
Property and equipment and related assets | $ 2,710,996,000 | $ 2,883,475,000 |  |  |  |  |
Intangible assets | 17,248,000 | 19,497,000 | 21,747,000 |  |  |  |
Intangible assets related to acquisition of Atlantic Southeast |  |  |  |  |  |  | 33,700,000
Period for amortization of intangible assets (in years) |  |  |  | 15 |  |  |
Accumulated amortization expense |  |  |  |  | 16,500,000 | 14,300,000 |
Capitalized Interest |  |  |  |  |  |  |
Capitalized interest costs | $ 0 | $ 0 | $ 5,000 |  |  |  |

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