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Nature of Operations and Summary of Significant Accounting Policies (Details 6) - USD ($) $ in Thousands | Sep. 07, 2005 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Impairment of Long Lived and Intangible Assets |  |  |  |
Property and equipment and related assets |  | $ 5,556,728 | $ 4,923,563 |
Intangible assets |  | 10,499 | 12,748 | $ 14,998
Atlantic Southeast Airlines Inc |  |  |  |
Impairment of Long Lived and Intangible Assets |  |  |  |
Intangible assets related to acquisition of Atlantic Southeast | $ 33,700 |  |  |
Period for amortization of intangible assets | 15 years |  |  |
Accumulated amortization expense |  | $ 23,300 | $ 21,000 |

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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) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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