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Retirement Benefit Plans (Changes in Benefit Obligations and Plan Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit obligation: at beginning of year | $ 513,844 | $ 479,281 |  |  |
Service cost | 12,414 | 15,381 | $ 14,098 |  |
Interest cost | 16,762 | 16,514 | 16,907 |  |
Plan amendments |  | (17,315) |  |  |
Net actuarial gain (loss) | (30,796) | 39,419 |  |  |
Benefit paid | (20,207) | (19,436) |  |  |
Benefit obligation, end of year | 492,017 | 513,844 | 479,281 |  |
Fair value of plan assets: at beginning of year | 564,365 | 515,555 |  |  |
Actual return on plan assets | (40,491) | 68,307 |  |  |
Employer contributions | 40,138 | 1,132 |  |  |
Plan participants' contributions |  |  |  |  |
Benefit payments | (20,207) | (19,436) |  |  |
Expenses | (1,187) | (1,193) |  |  |
Fair value of plan assets, end of year | 542,618 | 564,365 | 515,555 |  |
Funded status at end of year-net asset (liability) |  |  |  | $ 50,601 | $ 50,521
Unrecognized loss: at beginning of year | 102,978 | 115,910 |  |  |
Net actuarial loss (gain) | 46,492 | (12,932) |  |  |
Unrecognized (gain) loss at end of year | 149,470 | 102,978 | 115,910 |  |
Projected benefit obligation | 513,844 | 479,281 | 479,281 | 492,017 | 513,844
Accumulated benefit obligation |  |  |  | 467,300 | 489,075
Fair value of plan assets | 564,365 | 515,555 | 515,555 | 542,618 | 564,365
Other Post-Retirement Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit obligation: at beginning of year | 23,036 | 22,481 |  |  |
Service cost | 120 | 129 | 170 |  |
Interest cost | 621 | 668 | 773 |  |
Plan participants' contributions | 628 | 636 |  |  |
Net actuarial gain (loss) | (6,717) | 993 |  |  |
Benefit paid | (1,405) | (1,871) |  |  |
Benefit obligation, end of year | 16,283 | 23,036 | 22,481 |  |
Fair value of plan assets: at beginning of year |  |  |  |  |
Actual return on plan assets |  |  |  |  |
Employer contributions | 777 | 1,235 |  |  |
Plan participants' contributions | 628 | 636 |  |  |
Benefit payments | (1,405) | (1,871) |  |  |
Expenses |  |  |  |  |
Fair value of plan assets, end of year |  |  |  |  |
Funded status at end of year-net asset (liability) |  |  |  | (16,283) | (23,036)
Unrecognized loss: at beginning of year | (732) | (2,078) |  |  |
Net actuarial loss (gain) | (6,283) | 1,346 |  |  |
Unrecognized (gain) loss at end of year | (7,015) | (732) | (2,078) |  |
Projected benefit obligation | 23,036 | 22,481 | 22,481 | 16,283 | 23,036
Fair value of plan assets |  |  |  |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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