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Leases (Future annual minimum rental commitments) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]      
Rental expense $ 3,700,000 $ 3,100,000 $ 2,500,000
Future annual minimum rental commitments      
2013 3,962,000    
2014 4,074,000    
2015 3,571,000    
2016 2,809,000    
2017 2,581,000    
Thereafter 6,490,000    
Future annual minimum rental commitments, total $ 23,487,000