Fixed Assets and Intangible Assets, Net (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Estimated future amortization and depreciation of intangible and tangible assets  
2012 $ 138,890
2013 135,911
2014 130,862
2015 96,743
2016 and thereafter 76,057
Estimated future amortization and depreciation of intangible and tangible assets, Total $ 578,463