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Retirement Benefit Plans Part 1 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan [Abstract] |  |  |
Total cost of benefits for U.S. and Non-U.S. Plans | $ 11,926 | $ 13,253 | $ 12,108
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 | $ 8,073 | 4,404 | 8,359
Pension Plan | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 6,408 | 6,305 |
Pension Plan | Level 2 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plan | Level 3 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 10,842 | 11,163 |
Pension Plan | Cash and Cash Equivalents | Level 1 |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 6,408 | 6,305 |
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 | 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 | 10,842 | 11,163 |
Pension Plan | Fair Value |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 17,250 | 17,468 |
Pension Plan | Fair Value | Cash and Cash Equivalents |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 6,408 | 6,305 |
Pension Plan | Fair Value | Investment Account held by Pension Plan |  |  |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 10,842 | 11,163 |
Domestic Plan | Pension Plan |  |  |
Defined Contribution Plan [Abstract] |  |  |
Excess assets transferred | 0 | (6,305) |
Fair Value of Plan Assets by Investment Type |  |  |
Fair value of plan assets | 0 | 0 | 46,389
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 | 10,842 | 11,163 | 9,562
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 | 11,163 | 9,562 |
Purchases, sales, issuances and settlements, net | (856) | (535) |
Net gain | 1,138 | 1,190 |
Foreign currency | (603) | 946 |
Fair value at end of year | $ 10,842 | $ 11,163 | $ 9,562

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