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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans    
Settlement charge $ 0 $ 0
Pension Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Plan contributions 114  
Pension Plans | Domestic Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Service cost 0 0
Interest cost 11 390
Expected return on plan assets 0 (585)
Amortization of net actuarial loss 13 10
Amortization of prior service cost 0 0
Foreign currency 0 0
Net periodic cost (benefit) 24 (185)
Settlement charge 50  
Net benefit cost (credit) 74 (185)
Pension Plans | Foreign Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Service cost 37 24
Interest cost 71 90
Expected return on plan assets (109) (96)
Amortization of net actuarial loss 0 0
Amortization of prior service cost 74 47
Foreign currency (71) (5)
Net periodic cost (benefit) 2 60
Net benefit cost (credit) 2 60
Postretirement Medical Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Plan contributions 269  
Service cost 14 20
Interest cost 75 91
Expected return on plan assets 0 0
Amortization of net actuarial loss 0 0
Amortization of prior service cost 0 0
Foreign currency 0 0
Net periodic cost (benefit) 89 111
Net benefit cost (credit) $ 89 $ 111