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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases [Abstract]      
Rental expense charged to operations under operating leases $ 2,786 $ 2,544 $ 2,436
Minimum rental commitments for all noncancelable operating leases [Abstract]      
2016 1,670    
2017 1,433    
2018 535    
2019 393    
2020 280    
Thereafter 131    
Total $ 4,442