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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Rent expense $ 19,000 $ 18,700 $ 18,400
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 18,013    
2020 17,254    
2021 15,681    
2022 13,735    
2023 11,367    
Thereafter 43,307    
Total $ 119,357