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Retirement Benefit Plans (Changes in Benefit Obligations and Plan Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | $ 492,017 | $ 513,844 |
Service cost | 10,981 | 12,414 | $ 15,381
Interest cost | 18,843 | 16,762 | 16,514
Net actuarial (gain) loss | 81,166 | (30,796) |
Benefits paid | (21,141) | (20,207) |
Benefit obligation, end of year | 581,866 | 492,017 | 513,844
Fair value of plan assets at beginning of year | 542,618 | 564,365 |
Actual return on plan assets | 130,745 | (40,491) |
Employer contributions | 101,165 | 40,138 |
Benefit payments | (21,141) | (20,207) |
Expenses | (1,249) | (1,187) |
Fair value of plan assets, end of year | 752,138 | 542,618 | 564,365
Funded status at end of year - net asset (liability) | 170,272 | 50,601 |
Unrecognized loss at beginning of year | 149,470 | 102,978 |
Net actuarial loss (gain) | (13,218) | 46,492 |
Unrecognized gain (loss) at end of year | 136,252 | 149,470 | 102,978
Accumulated benefit obligation | 550,005 | 467,300 |
Other Post-Retirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | 16,283 | 23,036 |
Service cost | 95 | 120 | 129
Interest cost | 621 | 621 | 668
Plan participants' contributions | 547 | 628 |
Net actuarial (gain) loss | 733 | (6,717) |
Benefits paid | (1,566) | (1,405) |
Benefit obligation, end of year | 16,713 | 16,283 | 23,036
Employer contributions | 1,019 | 777 |
Plan participants' contributions | 547 | 628 |
Benefit payments | (1,566) | (1,405) |
Funded status at end of year - net asset (liability) | (16,713) | (16,283) |
Unrecognized loss at beginning of year | (7,015) | (732) |
Net actuarial loss (gain) | 1,646 | (6,283) |
Unrecognized gain (loss) at end of year | $ (5,369) | $ (7,015) | $ (732)

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