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Leases (Future annual minimum rental commitments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases [Abstract]      
Rental expense $ 5,000 $ 5,600 $ 5,100
Future annual minimum rental commitments      
2015 4,316    
2016 3,652    
2017 2,274    
2018 2,266    
2019 1,266    
Thereafter 2,407    
Total $ 16,181