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Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost of Pension and Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Domestic Plans | Pension Plans    
Net periodic benefit cost:    
Service cost $ 15 $ 2
Interest cost 214 187
Expected return on plan assets (34) (35)
Recognized net actuarial loss 106 122
Net periodic benefit cost 301 276
Domestic Plans | Postretirement Benefit Plans    
Net periodic benefit cost:    
Service cost 20 24
Interest cost 124 94
Amortization of prior service credit (47) (84)
Recognized net actuarial loss 77 52
Net periodic benefit cost 174 86
Foreign Pension Plans    
Net periodic benefit cost:    
Service cost 101 142
Interest cost 94 92
Expected return on plan assets (122) (129)
Recognized net actuarial loss 38 41
Net periodic benefit cost $ 111 $ 146