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Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Rental Expense      
Aggregate rental expense for leased assets $ 10,045 $ 10,372 $ 10,880
Operating Leases, Future Rental Payments      
2013 9,262    
2014 6,805    
2015 5,925    
2016 5,030    
2017 3,961    
Thereafter 14,715    
Total $ 45,698