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Leases (Future annual minimum rental commitments) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases [Abstract]      
Rental expense $ 5,100,000 $ 3,700,000 $ 3,100,000
Future annual minimum rental commitments      
2014 4,314,000    
2015 3,935,000    
2016 3,352,000    
2017 3,124,000    
2018 2,355,000    
Thereafter 6,044,000    
Future annual minimum rental commitments, total $ 23,124,000