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Retirement Benefit Plans Part 1 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plan [Abstract]      
Total cost of benefits for U.S. and Non-U.S. Plans $ 11,926 $ 13,253 $ 12,108
Maximum employer contribution to 401(k) Plan as a percentage of employee's compensation 3.00%    
Minimum service period required to be eligible for profit sharing contribution to 401(k) plan (in years) 1    
Expenses for 401(k) Plan $ 8,073 4,404 8,359
Pension Plan | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 6,408 6,305  
Pension Plan | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
Pension Plan | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 10,842 11,163  
Pension Plan | Cash and Cash Equivalents | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 6,408 6,305  
Pension Plan | Cash and Cash Equivalents | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
Pension Plan | Cash and Cash Equivalents | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
Pension Plan | Investment Account held by Pension Plan | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
Pension Plan | Investment Account held by Pension Plan | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
Pension Plan | Investment Account held by Pension Plan | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 10,842 11,163  
Pension Plan | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 17,250 17,468  
Pension Plan | Fair Value | Cash and Cash Equivalents      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 6,408 6,305  
Pension Plan | Fair Value | Investment Account held by Pension Plan      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 10,842 11,163  
Domestic Plan | Pension Plan      
Defined Contribution Plan [Abstract]      
Excess assets transferred 0 (6,305)  
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0 46,389
Foreign Plan | Pension Plan      
Defined Contribution Plan [Abstract]      
Excess assets transferred 0 0  
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 10,842 11,163 9,562
Foreign Plan | U.K. Pension Plan | Pension Plan      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value at beginning of year 11,163 9,562  
Purchases, sales, issuances and settlements, net (856) (535)  
Net gain 1,138 1,190  
Foreign currency (603) 946  
Fair value at end of year $ 10,842 $ 11,163 $ 9,562