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Rental Expense and Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Rental Expense and Lease Commitments      
Rent expense $ 22,700 $ 24,500 $ 24,300
Future minimum rental commitments under non-cancelable operating leases      
2019 16,488    
2020 9,797    
2021 5,757    
2022 2,913    
2023 2,320    
Thereafter 5,161    
Total $ 42,436