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Retirement Benefit Plans Part 1 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Total cost of benefit for U.S. and Non-U.S. Plans $ 12,428 $ 11,334 $ 11,766
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 $ 8,098 7,475 6,423
U.K. Pension Plan      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value at beginning of year 9,989 9,733  
Purchases, sales, issuances and settlements, net 52 (96)  
Net gain 1,232 974  
Foreign currency (582) (622)  
Fair value at end of year 10,691 9,989 $ 9,733
U.S. and U.K. Pension Plans | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 57,892 61,874  
U.S. and U.K. Pension Plans | Level 1      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 47,201 51,885  
U.S. and U.K. Pension Plans | Level 2      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 0  
U.S. and U.K. Pension Plans | Level 3      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 10,691 9,989  
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 954 486  
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 954 486  
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 | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 9,194 12,955  
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 9,194 12,955  
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 | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,258 4,004  
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 2,258 4,004  
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 | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,206 3,788  
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 2,206 3,788  
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 | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 32,589 30,652  
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 32,589 30,652  
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 | Investment Account Held By Pension Plan | Fair Value      
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 10,691 [1] 9,989  
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 $ 10,691 [1] $ 9,989  
[1] This category is comprised of investments in insurance contracts.