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Retirement Benefit Plans Part 1 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Total cost of benefits for U.S. and Non-U.S. Plans $ 12,108 $ 12,428 $ 11,334
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 $ 8,359 8,098 7,475
U.K. Pension Plan      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value at beginning of year 10,691 9,989  
Purchases, sales, issuances and settlements, net 7 52  
Net gain 674 1,232  
Foreign currency (1,810) (582)  
Fair value at end of year 9,562 10,691 $ 9,989
U.S. and U.K. Pension Plans | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 19,858 47,201  
U.S. and U.K. Pension Plans | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 26,531 0  
U.S. and U.K. Pension Plans | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 9,562 10,691  
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 663 954  
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 9,803 9,194  
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,584 2,258  
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - International Equities | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,244 2,206  
U.S. and U.K. Pension Plans | Mutual Funds - International Equities | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - International Equities | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 4,564 32,589  
U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Collective Investment Funds | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans | Collective Investment Funds | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 26,531    
U.S. and U.K. Pension Plans | Collective Investment Funds | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [1] 0  
U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [1] 0  
U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 9,562 [1] 10,691  
Fair Value | U.S. and U.K. Pension Plans      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 55,951 57,892  
Fair Value | U.S. and U.K. Pension Plans | Cash and Cash Equivalents      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 663 954  
Fair Value | U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 9,803 9,194  
Fair Value | U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,584 2,258  
Fair Value | U.S. and U.K. Pension Plans | Mutual Funds - International Equities      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,244 2,206  
Fair Value | U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 4,564 32,589  
Fair Value | U.S. and U.K. Pension Plans | Collective Investment Funds      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 26,531    
Fair Value | U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets $ 9,562 [1] $ 10,691  
[1] This category is comprised of investments in insurance contracts.