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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Rent expense $ 18,700 $ 18,400 $ 18,100
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 17,417    
2019 15,730    
2020 14,592    
2021 12,988    
2022 10,763    
Thereafter 45,905    
Total $ 117,395