| 
           Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        6 Months Ended | 
|---|---|
| 
           Jun. 30, 2014 
         | 
      |
| Goodwill and Other Intangible Assets [Abstract] | |
| Goodwill as of December 31, 2013 | $ 1,195,891 | 
| Goodwill acquired | 7,700 | 
| Translation differences | (300) | 
| Goodwill as of June 30, 2014 | $ 1,203,296 | 
| X | ||||||||||
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- Definition 
          Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Details 
          
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| X | ||||||||||
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- Definition 
          Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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