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Goodwill and Intangible Assets (Future amortization expense) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Future amortization expense:      
2013 $ 2,533    
2014 2,533    
2015 2,533    
2016 2,533    
2017 2,533    
2018 and thereafter 14,780    
Net carrying value $ 27,445 $ 29,978 $ 32,956
Expected remaining useful life 10 years 9 months 18 days