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Retirement Benefit Plans Part 1 (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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.

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- Definition Maximum employer matching contribution as percentage of employee's compensation. + References No definition available. + Details
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- Definition Minimum service period required to be eligible for profit sharing contribution to the 401(k) plan. + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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