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Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 $ 6,843    
2019 6,676    
2020 6,029    
2021 5,123    
Thereafter 11,186    
Operating Leases, Future Minimum Payments Due 35,857    
Operating Leases, Rent Expense $ 5,800 $ 5,300 $ 5,600