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Rental Expense and Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Rental Expense and Lease Commitments      
Rent expense $ 24,300 $ 23,700 $ 22,600
Future minimum rental commitments under non-cancelable operating leases      
2017 22,494    
2018 17,759    
2019 12,875    
2020 7,859    
2021 4,847    
Thereafter 9,843    
Total $ 75,677