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Intangible Assets Annual Amortization of Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Annual amortization of intangible assets and liabilities    
Intangible Assets, net $ 66,104 $ 70,620
Assets [Member]
   
Annual amortization of intangible assets and liabilities    
2013 11,562  
2014 12,871  
2015 10,494  
2016 6,166  
2017 4,894  
Thereafter 20,117  
Intangible Assets, net 66,104  
Liabilities [Member]
   
Annual amortization of intangible assets and liabilities    
2013 5,715  
2014 6,081  
2015 3,914  
2016 1,974  
2017 1,445  
Thereafter 12,773  
Intangible Assets, net $ 31,902