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Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases [Abstract]      
Rental expense for property, plant and equipment $ 16,900 $ 18,900 $ 19,700
Operating leases      
2017 12,482    
2018 9,187    
2019 7,429    
2020 6,434    
2021 5,040    
After 2021 16,932    
Minimum rentals to be received under noncancelable subleases $ 1,100