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Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Rental Expense      
Aggregate rental expense for leased assets $ 10,338 $ 10,045 $ 10,372
Operating Leases, Future Rental Payments      
2014 9,421    
2015 7,856    
2016 6,245    
2017 4,542    
2018 2,860    
Thereafter 13,317    
Total $ 44,241