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Summary of Significant Accounting Policies Intangible Assets (Details) - Orbitz
12 Months Ended
Dec. 31, 2014
Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 4 years
Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 8 years