| 
           Stockholders' Equity (Details) (Common Stock [Member], USD $) 
        In Thousands, except Share data, unless otherwise specified  | 
        9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 
           Sep. 30, 2014 
         | 
        
           Sep. 30, 2014
 
          Open Market And Privately Negotiated Repurchases [Member] 
         | 
        
           Sep. 30, 2014
 
          May ASR Agreement [Member] 
         | 
        
           Sep. 30, 2014
 
          August ASR Agreement [Member] 
         | 
        
           Sep. 30, 2014
 
          August ASR Agreement [Member] 
         | 
        
           Apr. 25, 2014
 
          Liberty Media [Member]
 
          Amended October 2013 Share Repurchase Program [Member] 
         | 
        
           Sep. 30, 2014
 
          Liberty Media [Member]
 
          Amended October 2013 Share Repurchase Program [Member] 
         | 
        
           Dec. 31, 2013
 
          Liberty Media [Member]
 
          October 2013 Share Repurchase Program [Member] 
         | 
        
           Apr. 25, 2014
 
          Liberty Media [Member]
 
          October 2013 Share Repurchase Program [Member] 
         | 
        
           Oct. 24, 2014
 
          Subsequent Event [Member]
 
          Open Market And Privately Negotiated Repurchases [Member] 
         | 
        
           Oct. 01, 2014
 
          Subsequent Event [Member]
 
          August ASR Agreement [Member] 
         | 
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| Equity, Class of Treasury Stock [Line Items] | |||||||||||||||||||||||
| Number of shares repurchases and retired | 570,055,203 | 273,435,722 | [1] | 151,846,125 | [2] | 51,884,795 | [3] | 92,888,561 | [4] | ||||||||||||||
| Stock repurchased and retired during period, value | $ 340,000 | $ 160,000 | $ 81,007 | ||||||||||||||||||||
| Number of shares repurchased and retired | 151,846,125 | 51,884,795 | 92,888,561 | 24,555,150 | 19,431,708 | ||||||||||||||||||
| Share price (in dollars per share) | $ 3.66 | ||||||||||||||||||||||
          
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