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Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Rental expense for property, plant and equipment $ 16,200 $ 16,500 $ 16,900
Operating leases      
2019 13,985    
2020 12,204    
2021 9,448    
2022 7,706    
2023 6,201    
After 2023 28,442    
Minimum rentals to be received under noncancelable subleases $ 500