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Retirement Benefit Plans Part 1 (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Retirement Benefit Plans [Abstract]      
Total cost of benefits for U.S. and Non-U.S. plans $ 11,131 $ 11,231 $ 10,101
Maximum employer contribution to 401 (k) plan as percentage of employee's compensation (in hundredths) 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 6,864 7,073 6,676
U.S. and U.K. Pension Plans [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 35,975    
U.S. and U.K. Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 28,237    
U.S. and U.K. Pension Plans [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 7,738    
U.S. and U.K. Pension Plans [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Cash and Cash Equivalents [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 533    
U.S. and U.K. Pension Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 533    
U.S. and U.K. Pension Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Small-Cap [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 445 [1]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Small-Cap [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 445 [1]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Small-Cap [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0 [1]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Small-Cap [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0 [1]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - International Small-Cap [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 116 [2]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - International Small-Cap [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 116 [2]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - International Small-Cap [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0 [2]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - International Small-Cap [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0 [2]    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - Corporate Debt Securities [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 11,557    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 11,557    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Mid-Cap [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 2,761    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Mid-Cap [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 2,761    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Mid-Cap [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Mid-Cap [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - U.S. Large-Cap [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 12,646 [3]    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - U.S. Large-Cap [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 12,646 [3]    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - U.S. Large-Cap [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0 [3]    
U.S. and U.K. Pension Plans [Member] | Mutual Funds - U.S. Large-Cap [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0 [3]    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Large -Cap [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 179    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Large -Cap [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 179    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Large -Cap [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Equity Securities - U.S. Large -Cap [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 0    
U.S. and U.K. Pension Plans [Member] | Investment Account Held By Pension Plan [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 7,738 [4]    
U.S. and U.K. Pension Plans [Member] | Investment Account Held By Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets 7,739 [4]    
U.S. and U.K. Pension Plans [Member] | Investment Account Held By Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value of plan assets by investment type [Abstract]      
Fair value of plan assets $ 0    
[1] This category is comprised of actively managed domestic common stocks.
[2] This category is comprised of actively managed international common stocks.
[3] This category is comprised of funds not actively managed that track the S&P 500.
[4] This category is comprised of foreign and domestic equities and foreign and domestic fixed interest assets.