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Intangible Assets Annual Amortization of Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Annual amortization of intangible assets and liabilities    
Intangible Assets, net $ (125,162) $ (132,329)
Assets [Member]
   
Annual amortization of intangible assets and liabilities    
2013 19,879  
2014 23,314  
2015 18,573  
2016 16,573  
2017 12,161  
Thereafter 34,662  
Intangible Assets, net (125,162)  
Liabilities [Member]
   
Annual amortization of intangible assets and liabilities    
2013 (5,401)  
2014 (5,455)  
2015 (3,486)  
2016 (2,890)  
2017 (2,353)  
Thereafter (12,644)  
Intangible Assets, net $ 32,229