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Retirement Benefit Plans Part 1 (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Total cost of benefit for U.S. and Non-U.S. Plans $ 11,078 $ 11,131 $ 11,231
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 6,226 6,864 7,073
Mutual Funds - International Large Cap | Fair Value
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 5,662 [1]    
Mutual Funds - International Large Cap | Level 1
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 5,662 [1]    
Mutual Funds - International Large Cap | Level 2
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [1]    
Mutual Funds - International Large Cap | Level 3
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [1]    
U.S. and U.K. Pension Plans | Fair Value
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 55,797    
U.S. and U.K. Pension Plans | Level 1
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 46,942    
U.S. and U.K. Pension Plans | Level 2
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 8,855    
U.S. and U.K. Pension Plans | Level 3
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0    
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 701    
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 701    
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    
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    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Fair Value
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 1,438 [2]    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Level 1
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 1,438 [2]    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Level 2
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [2]    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Level 3
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [2]    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Fair Value
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,266 [2]    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Level 1
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 2,266 [2]    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Level 2
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [2]    
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Level 3
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [2]    
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Fair Value
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 63 [3]    
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Level 1
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 63 [3]    
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Level 2
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [3]    
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Level 3
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0 [3]    
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Fair Value
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 18,671    
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Level 1
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 18,671    
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Level 2
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Level 3
     
Fair Value of Plan Assets by Investment Type      
Fair value of plan assets 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 18,141 [4]    
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 18,141 [4]    
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 [4]    
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 [4]    
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 8,855 [5]    
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 [5]    
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 8,855 [5]    
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 $ 0 [5]    
[1] This category is comprised of funds not actively managed that are invested in foreign and domestic equities.
[2] This category is comprised of actively managed domestic common stocks.
[3] This category is comprised of actively managed international common stocks.
[4] This category is comprised of funds not actively managed that track the S&P 500.
[5] This category is comprised of foreign and domestic equities and foreign and domestic fixed interest assets.