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Intangible Assets Annual Amortization of Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Annual amortization of intangible assets and liabilities    
Intangible Assets, net $ (112,140) $ (132,329)
Assets [Member]
   
Annual amortization of intangible assets and liabilities    
2013 12,075  
2014 21,581  
2015 17,102  
2016 15,279  
2017 11,458  
Thereafter 34,645  
Intangible Assets, net (112,140)  
Liabilities [Member]
   
Annual amortization of intangible assets and liabilities    
2013 (3,093)  
2014 (5,223)  
2015 (3,254)  
2016 (2,664)  
2017 (2,241)  
Thereafter (12,641)  
Intangible Assets, net $ 29,116