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Retirement Benefit Plans (Fair Values of Pension Plan Assets) (Details) - Pension Benefits [Member] - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 515,555,000 | $ 491,550,000 | $ 438,708,000
Cash And Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 15,568,000 | 44,224,000 |
Total Cash and Cash-Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 44,224,000 |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 136,085,000 | 105,721,000 |
Mutual Fund-Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 48,805,000 | 47,453,000 |
Total Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 184,890,000 | 153,174,000 |
Domestic And Foreign Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 104,461,000 | 97,905,000 |
Mutual Funds-Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 157,630,000 | 147,051,000 |
Total Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 262,091,000 | 244,956,000 |
Real Assets Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 27,690,000 | 24,653,000 |
Total Real Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 490,239,000 | 467,007,000 |
Common Trust Fund (Fixed Income) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 25,316,000 | 24,543,000 |
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 354,148,000 | 361,276,000 |
Level 1 [Member] | Cash And Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 15,568,000 | 44,224,000 |
Level 1 [Member] | Total Cash and Cash-Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 44,224,000 |
Level 1 [Member] | Mutual Fund-Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 48,805,000 | 47,453,000 |
Level 1 [Member] | Total Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 48,805,000 | 47,453,000 |
Level 1 [Member] | Domestic And Foreign Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 104,455,000 | 97,895,000 |
Level 1 [Member] | Mutual Funds-Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 157,630,000 | 147,051,000 |
Level 1 [Member] | Total Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 262,085,000 | 244,946,000 |
Level 1 [Member] | Real Assets Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 27,690,000 | 24,653,000 |
Level 1 [Member] | Total Real Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 354,148,000 | 361,276,000 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 136,091,000 | 105,731,000 |
Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 136,085,000 | 105,721,000 |
Level 2 [Member] | Total Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 136,085,000 | 105,721,000 |
Level 2 [Member] | Domestic And Foreign Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 6,000 | 10,000 |
Level 2 [Member] | Total Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 6,000 | 10,000 |
Level 2 [Member] | Total Real Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 136,091,000 | 105,731,000 |
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 0 | $ 0 |

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