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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Annual amortization of intangible assets and liabilities    
Total $ 52,575 $ 70,515
Assets [Member]
   
Annual amortization of intangible assets and liabilities    
2012 (three months remaining) 3,603  
2013 12,076  
2014 9,299  
2015 6,909  
2016 4,436  
Thereafter 16,252  
Total 52,575  
Liabilities [Member]
   
Annual amortization of intangible assets and liabilities    
2012 (three months remaining) 1,642  
2013 6,284  
2014 4,741  
2015 2,597  
2016 1,704  
Thereafter 12,856  
Total $ 29,824