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Commitments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leased Assets [Line Items]      
Lease Commitments, 2013 $ 3,976    
Lease Commitments, 2014 3,430    
Lease Commitments, 2015 2,887    
Lease Commitments, 2016 2,264    
Lease Commitments, 2017 2,226    
Lease Commitments, Thereafter 3,958    
Lease Commitments, Total 18,741    
Sublease Rentals, 2013 402    
Sublease Rentals, 2014 0    
Sublease Rentals, 2015 0    
Sublease Rentals, 2016 0    
Sublease Rentals, 2017 0    
Sublease Rentals, Thereafter 0    
Sublease Rentals, Total 402    
Net, 2013 3,574    
Net, 2014 3,430    
Net, 2015 2,887    
Net, 2016 2,264    
Net, 2017 2,226    
Net, Thereafter 3,958    
Net, Total 18,339    
Rental expense $ 4,100 $ 4,313 $ 3,670
Minimum [Member]
     
Operating Leased Assets [Line Items]      
Operating lease term 1 year