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Commitments 4 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases:      
Consolidated rent expense $ 2,448 $ 2,298 $ 2,740
Future minimum payments under long-term non-cancelable operating leases      
2014 2,250    
2015 1,934    
2016 1,717    
2017 819    
2018 892    
Thereafter 339    
Total $ 7,951