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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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+ 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

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