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Retirement Benefit Plans Part 1 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plan [Abstract] |  |  |
Total cost of benefits for U.S. and Non-U.S. Plans | $ 13,253 | $ 12,108 | $ 12,428
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 | $ 4,404 | 8,359 | 8,098
Pension Plan | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 6,305 | 19,858 |
Pension Plan | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 0 | 26,531 |
Pension Plan | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 11,163 | 9,562 |
Pension Plan | Cash and Cash Equivalents | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 6,305 | 663 |
Pension Plan | Cash and Cash Equivalents | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plan | Cash and Cash Equivalents | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plan | Mutual Funds - U.S. Large-Cap | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 9,803 |
Pension Plan | Mutual Funds - U.S. Large-Cap | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Mutual Funds - U.S. Large-Cap | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Mutual Funds - U.S. Small-Cap | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 2,584 |
Pension Plan | Mutual Funds - U.S. Small-Cap | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Mutual Funds - U.S. Small-Cap | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Mutual Funds - International Equities | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 2,244 |
Pension Plan | Mutual Funds - International Equities | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Mutual Funds - International Equities | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Mutual Funds - Fixed-Income Domestic | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 4,564 |
Pension Plan | Mutual Funds - Fixed-Income Domestic | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Mutual Funds - Fixed-Income Domestic | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Collective Investment Funds [Member] | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Collective Investment Funds [Member] | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 26,531 |
Pension Plan | Collective Investment Funds [Member] | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 0 |
Pension Plan | Investment Account held by Pension Plan | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plan | Investment Account held by Pension Plan | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plan | Investment Account held by Pension Plan | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 11,163 | 9,562 |
Pension Plan | Fair Value |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 17,468 | 55,951 |
Pension Plan | Fair Value | Cash and Cash Equivalents |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 6,305 | 663 |
Pension Plan | Fair Value | Mutual Funds - U.S. Large-Cap |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 9,803 |
Pension Plan | Fair Value | Mutual Funds - U.S. Small-Cap |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 2,584 |
Pension Plan | Fair Value | Mutual Funds - International Equities |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 2,244 |
Pension Plan | Fair Value | Mutual Funds - Fixed-Income Domestic |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 4,564 |
Pension Plan | Fair Value | Collective Investment Funds [Member] |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets |  | 26,531 |
Pension Plan | Fair Value | Investment Account held by Pension Plan |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 11,163 | 9,562 |
Foreign Plan | Pension Plan |  |  |
Defined Contribution Plan [Abstract] |  |  |
Excess assets transferred | 0 | 0 |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 11,163 | 9,562 | 10,691
Foreign Plan | U.K. Pension Plan | Pension Plan |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value at beginning of year | 9,562 | 10,691 |
Purchases, sales, issuances and settlements, net | (535) | 7 |
Net gain | 1,190 | 674 |
Foreign currency | 946 | (1,810) |
Fair value at end of year | $ 11,163 | $ 9,562 | $ 10,691

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