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Intangible Assets Annual Amortization of Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Annual amortization of intangible assets and liabilities    
Intangible Assets, net $ 54,457 $ 70,620
Assets [Member]
   
Annual amortization of intangible assets and liabilities    
2013 3,787  
2014 13,335  
2015 10,661  
2016 6,285  
2017 5,117  
Thereafter 15,272  
Intangible Assets, net 54,457  
Liabilities [Member]
   
Annual amortization of intangible assets and liabilities    
2013 1,915  
2014 6,179  
2015 4,014  
2016 2,074  
2017 1,545  
Thereafter 12,773  
Intangible Assets, net $ 28,500