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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.

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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=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&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 Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&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=56944662&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=26872669&loc=d3e20235-122688 Reference 3: 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=49170846&loc=d3e28014-114942 + Details
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