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Intangible Assets Annual Amortization of Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Annual amortization of intangible assets and liabilities    
Intangible Assets, net $ 59,919 $ 70,620
Assets [Member]
   
Annual amortization of intangible assets and liabilities    
2013 8,044  
2014 13,740  
2015 11,063  
2016 6,497  
2017 5,206  
Thereafter 15,369  
Intangible Assets, net 59,919  
Liabilities [Member]
   
Annual amortization of intangible assets and liabilities    
2013 3,840  
2014 6,181  
2015 4,016  
2016 2,076  
2017 1,547  
Thereafter 12,795  
Intangible Assets, net $ 30,455