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Retirement Benefit Plans (Fair Values of Pension Plan Assets) (Details) - Pension Benefits [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 542,619 | $ 564,365
Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,643 | 5,496
Total Cash and Cash-Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,643 | 5,496
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 116,881 | 113,331
Mutual Fund-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,701 | 31,839
Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 148,582 | 145,170
Domestic And Foreign Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 80,819 | 102,422
Mutual Funds-Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 150,466 | 168,299
Total Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 231,285 | 270,721
Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 388,510 | 421,387
Common Trust Fund (Fixed Income) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 125,706 | 114,068
Common Trust Fund (Real Assets) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 28,402 | 28,910
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 291,334 | 308,050
Level 1 [Member] | Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,643 | 5,496
Level 1 [Member] | Total Cash and Cash-Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,643 | 5,496
Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 19,856 |
Level 1 [Member] | Mutual Fund-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,556 | 31,839
Level 1 [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 51,412 | 31,839
Level 1 [Member] | Domestic And Foreign Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 80,813 | 102,416
Level 1 [Member] | Mutual Funds-Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 150,466 | 168,299
Level 1 [Member] | Total Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 231,279 | 270,715
Level 1 [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 291,334 | 308,050
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 97,031 | 113,175
Level 2 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 97,025 | 113,169
Level 2 [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 97,025 | 113,169
Level 2 [Member] | Domestic And Foreign Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6 | 6
Level 2 [Member] | Total Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6 | 6
Level 2 [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 97,031 | 113,175
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 145 |
Level 3 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 162
Level 3 [Member] | Mutual Fund-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 145 |
Level 3 [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 145 | 162
Level 3 [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 145 | $ 162

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