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Retirement Benefit Plans (Fair Values of Pension Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total Assets including Common Trust Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 815,304 | $ 752,138
Level 1 [Member] | Total Assets including Common Trust Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 417,127 | 388,420
Level 2 [Member] | Total Assets including Common Trust Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 43,076 | 45,951
Pension Benefits [Member] | Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,778 | 2,574
Pension Benefits [Member] | Total Cash and Cash-Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,778 | 2,574
Pension Benefits [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 72,603 | 69,401
Pension Benefits [Member] | Mutual Fund-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 22,087 | 34,652
Pension Benefits [Member] | Exchange Traded Fund (ETF)-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,750 | 3,134
Pension Benefits [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 98,440 | 107,187
Pension Benefits [Member] | Domestic And Foreign Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 97,966 | 88,174
Pension Benefits [Member] | Mutual Funds-Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 260,019 | 236,436
Pension Benefits [Member] | Total Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 357,985 | 324,610
Pension Benefits [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 460,203 | 434,371
Pension Benefits [Member] | Common Trust Fund (Fixed Income) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 298,694 | 258,572
Pension Benefits [Member] | Common Trust Fund (Real Assets) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 56,407 | 59,195
Pension Benefits [Member] | Level 1 [Member] | Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,778 | 2,574
Pension Benefits [Member] | Level 1 [Member] | Total Cash and Cash-Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,778 | 2,574
Pension Benefits [Member] | Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 29,527 | 23,450
Pension Benefits [Member] | Level 1 [Member] | Mutual Fund-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 22,087 | 34,652
Pension Benefits [Member] | Level 1 [Member] | Exchange Traded Fund (ETF)-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,750 | 3,134
Pension Benefits [Member] | Level 1 [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 55,364 | 61,236
Pension Benefits [Member] | Level 1 [Member] | Domestic And Foreign Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 97,966 | 88,174
Pension Benefits [Member] | Level 1 [Member] | Mutual Funds-Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 260,019 | 236,436
Pension Benefits [Member] | Level 1 [Member] | Total Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 357,985 | 324,610
Pension Benefits [Member] | Level 1 [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 417,127 | 388,420
Pension Benefits [Member] | Level 2 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 43,076 | 45,951
Pension Benefits [Member] | Level 2 [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 43,076 | 45,951
Pension Benefits [Member] | Level 2 [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 43,076 | $ 45,951

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- Definition Amount of investment within defined benefit plan asset category. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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