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           Business & Basis of Presentation (Details 1) (Common Stock [Member], Liberty Media [Member]) 
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           Sep. 30, 2014 
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           Common Stock [Member] | Liberty Media [Member] 
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| Related Party Transaction [Line Items] | |
| Related party ownership percentage (greater than 50%) | 50.00% | 
| X | ||||||||||
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- Definition 
          Related Party Transaction, Related Party Ownership Percentage No definition available. 
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- Details 
          
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