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           Intangible Assets (Details Textual) (USD $) 
         | 
        3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
| 
           Jun. 30, 2012 
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           Jun. 30, 2011 
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           Jun. 30, 2012 
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           Jun. 30, 2011 
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           Jun. 30, 2012
 
          Subscriber relationships [Member]
 
          Year 
         | 
        
           Jun. 30, 2012
 
          Licensing agreements [Member]
 
          Year 
         | 
        
           Jul. 31, 2008
 
          Trademarks [Member] 
         | 
      |
| Intangible Assets (Textual) [Abstract] | |||||||
| Purchase price related to merger | $ 250,000,000 | ||||||
| Impairment loss related to indefinite-lived intangibles | 0 | 0 | 0 | 0 | |||
| Intangible assets (Additional Textual) [Abstract] | |||||||
| Weighted average useful lives (in years) | 9 | 9.1 | |||||
| Amortization expense | $ 13,651,000 | $ 14,960,000 | $ 27,577,000 | $ 30,263,000 | |||
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- Definition 
          The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will not be amortized. Does not include goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Aggregate amount of intangible asset amortization recognized as expense during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          The calculated weighted-average useful life of all finite-lived intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an indefinite-lived intangible asset, other than goodwill, to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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