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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Rental expense $ 46,000 $ 45,000 $ 47,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 47,820    
2019 39,107    
2020 30,180    
2021 22,266    
2022 15,256    
Thereafter 63,685    
Total minimum lease payments $ 218,314