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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Operating leases, rent expense $ 19,300 $ 18,200 $ 18,100
Future Minimum Lease Payments [Abstract]      
2018 15,137    
2019 14,538    
2020 14,185    
2021 12,635    
2022 11,129    
Thereafter 58,658    
Total $ 126,282