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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract] |
Changes in Benefit Obligations and Plan Assets | The following tables detail the changes in the benefit obligations and plan assets of the defined benefit plans for the years ended December 31, 2020 and 2019, as well as the funded status of the plans at each year end and the amounts recognized in the Company’s consolidated balance sheets. The Company uses a December 31 measurement date for all defined benefit pension plans and other postretirement benefit plans.
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
(in thousands) |  | Pension Benefits |  |  | Other Post- Retirement Benefits |
Change in benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation, beginning of year |  | $ |  | 581,866 |  |  | $ |  | 492,017 |  |  | $ |  | 16,713 |  |  | $ |  | 16,283 |
Service cost |  |  |  | 12,898 |  |  |  |  | 10,981 |  |  |  |  | 105 |  |  |  |  | 95 |
Interest cost |  |  |  | 16,207 |  |  |  |  | 18,843 |  |  |  |  | 484 |  |  |  |  | 621 |
Plan participants' contributions |  |  |  | — |  |  |  |  | — |  |  |  |  | 538 |  |  |  |  | 547 |
Net actuarial loss |  |  |  | 70,777 |  |  |  |  | 81,166 |  |  |  |  | 1,910 |  |  |  |  | 733 |
Benefits paid |  |  |  | (21,439 | ) |  |  |  | (21,141 | ) |  |  |  | (1,420 | ) |  |  |  | (1,566 | )
Benefit obligation, end of year |  |  |  | 660,309 |  |  |  |  | 581,866 |  |  |  |  | 18,330 |  |  |  |  | 16,713 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year |  |  |  | 752,138 |  |  |  |  | 542,618 |  |  |  |  | — |  |  |  |  | — |
Actual return on plan assets |  |  |  | 84,810 |  |  |  |  | 130,745 |  |  |  |  | — |  |  |  |  | — |
Employer contributions |  |  |  | 1,178 |  |  |  |  | 101,165 |  |  |  |  | 882 |  |  |  |  | 1,019 |
Plan participants' contributions |  |  |  | — |  |  |  |  | — |  |  |  |  | 538 |  |  |  |  | 547 |
Benefit payments |  |  |  | (21,439 | ) |  |  |  | (21,141 | ) |  |  |  | (1,420 | ) |  |  |  | (1,566 | )
Expenses |  |  |  | (1,383 | ) |  |  |  | (1,249 | ) |  |  |  | — |  |  |  |  | — |
Fair value of plan assets, end of year |  |  |  | 815,304 |  |  |  |  | 752,138 |  |  |  |  | — |  |  |  |  | — |
Funded status at end of year - net asset (liability) |  | $ |  | 154,995 |  |  | $ |  | 170,272 |  |  | $ |  | (18,330 | ) |  | $ |  | (16,713 | )
Amounts recognized in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized loss at beginning of year |  | $ |  | 136,252 |  |  | $ |  | 149,470 |  |  | $ |  | (5,369 | ) |  | $ |  | (7,015 | )
Net actuarial loss (gain) |  |  |  | 28,518 |  |  |  |  | (13,218 | ) |  |  |  | 2,565 |  |  |  |  | 1,646 |
Unrecognized gain (loss) at end of year |  | $ |  | 164,770 |  |  | $ |  | 136,252 |  |  | $ |  | (2,804 | ) |  | $ |  | (5,369 | )
Projected benefit obligation |  | $ |  | 660,309 |  |  | $ |  | 581,866 |  |  |  |  |  |  |  |  |  |  |
Accumulated benefit obligation |  |  |  | 624,999 |  |  |  |  | 550,005 |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets |  |  |  | 815,304 |  |  |  |  | 752,138 |  |  |  |  |  |  |  |  |  |  |
Components of Net Periodic Benefits Cost | The following table shows net periodic benefit cost included in expense and the changes in the amounts recognized in AOCI during 2020, 2019, and 2018.
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2020 |  |  | 2019 |  |  | 2018 |
($ in thousands) |  | Pension Benefits |  |  | Other Post-Retirement Benefits |
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ |  | 12,898 |  |  | $ |  | 10,981 |  |  | $ |  | 12,414 |  |  | $ |  | 105 |  |  | $ |  | 95 |  |  | $ |  | 120 |
Interest cost |  |  |  | 16,207 |  |  |  |  | 18,843 |  |  |  |  | 16,762 |  |  |  |  | 484 |  |  |  |  | 621 |  |  |  |  | 621 |
Expected return on plan assets |  |  |  | (48,191 | ) |  |  |  | (45,199 | ) |  |  |  | (41,033 | ) |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Amortization of net loss/ prior service cost |  |  |  | 7,021 |  |  |  |  | 10,087 |  |  |  |  | 5,423 |  |  |  |  | (653 | ) |  |  |  | (913 | ) |  |  |  | (434 | )
Net periodic benefit cost |  |  |  | (12,065 | ) |  |  |  | (5,288 | ) |  |  |  | (6,434 | ) |  |  |  | (64 | ) |  |  |  | (197 | ) |  |  |  | 307 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income, before taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) gain recognized during the year |  |  |  | (7,021 | ) |  |  |  | (10,087 | ) |  |  |  | (5,423 | ) |  |  |  | 653 |  |  |  |  | 913 |  |  |  |  | 434 |
Net actuarial loss (gain) |  |  |  | 35,539 |  |  |  |  | (3,131 | ) |  |  |  | 51,915 |  |  |  |  | 1,912 |  |  |  |  | 733 |  |  |  |  | (6,717 | )
Total recognized in other comprehensive income |  |  |  | 28,518 |  |  |  |  | (13,218 | ) |  |  |  | 46,492 |  |  |  |  | 2,565 |  |  |  |  | 1,646 |  |  |  |  | (6,283 | )
Total recognized in net periodic benefit cost and other comprehensive income |  | $ |  | 16,453 |  |  | $ |  | (18,506 | ) |  | $ |  | 40,058 |  |  | $ |  | 2,501 |  |  | $ |  | 1,449 |  |  | $ |  | (5,976 | )
Discount rate for benefit obligations |  |  |  | 2.40 | % |  |  |  | 3.14 | % |  |  |  | 4.14 | % |  |  |  | 2.31 | % |  |  |  | 3.11 | % |  |  |  | 4.10 | %
Discount rate for net periodic benefit cost |  |  |  | 3.14 | % |  |  |  | 4.14 | % |  |  |  | 3.57 | % |  |  |  | 3.11 | % |  |  |  | 4.10 | % |  |  |  | 3.52 | %
Expected long-term return on plan assets |  |  |  | 6.50 | % |  |  |  | 7.25 | % |  |  |  | 7.25 | % |  |  | n/a |  |  |  | n/a |  |  |  | n/a |
Rate of compensation increase |  |  | scaled * |  |  |  | scaled * |  |  |  | scaled ** |  |  |  | n/a |  |  |  | n/a |  |  |  | n/a |
* | Graded scale, declining from 7.25% at age 20 to 2.25% at age 60
** | Graded scale, declining from 7.00% at age 20 t0 2.00% at age 60
Expected Plan Benefit Payments | The following table presents expected plan benefit payments over the ten years succeeding December 31, 2020:
(in thousands) |  | Pension |  |  | Post-Retirement |  |  | Total |
2021 |  | $ |  | 24,097 |  |  | $ |  | 989 |  |  | $ |  | 25,086 |
2022 |  |  |  | 25,244 |  |  |  |  | 929 |  |  |  |  | 26,173 |
2023 |  |  |  | 26,251 |  |  |  |  | 954 |  |  |  |  | 27,205 |
2024 |  |  |  | 27,546 |  |  |  |  | 912 |  |  |  |  | 28,458 |
2025 |  |  |  | 28,963 |  |  |  |  | 950 |  |  |  |  | 29,913 |
2026-2030 |  |  |  | 163,952 |  |  |  |  | 4,664 |  |  |  |  | 168,616 |
. |  | $ |  | 296,053 |  |  | $ |  | 9,398 |  |  | $ |  | 305,451 |
Fair Values of Pension Plan Assets | For all investments, the plan attempts to use quoted market prices of identical assets on active exchanges, or Level 1 measurements. Where such quoted market prices are not available, the plan will use quoted prices for similar instruments or discounted cash flows to estimate the value, reported as Level 2
|  | December 31, 2020 |
Fair Value Measurements by Asset Category / Fund |  |  | Level 1 |  |  |  | Level 2 |  |  |  | Level 3 |  |  | Total |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  | $ |  | 3,778 |  |  | $ |  | — |  |  | $ |  | — |  |  | $ |  | 3,778 |
Total cash and cash equivalents |  |  |  | 3,778 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 3,778 |
Fixed income securities |  |  |  | 29,527 |  |  |  |  | 43,076 |  |  |  |  | — |  |  |  |  | 72,603 |
Mutual fund-fixed income |  |  |  | 22,087 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 22,087 |
Exchange Traded Fund (ETF)-Fixed income |  |  |  | 3,750 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 3,750 |
Total fixed income |  |  |  | 55,364 |  |  |  |  | 43,076 |  |  |  |  | — |  |  |  |  | 98,440 |
Domestic and foreign stock |  |  |  | 97,966 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 97,966 |
Mutual funds-equity |  |  |  | 260,019 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 260,019 |
Total equity |  |  |  | 357,985 |  |  |  |  |  |  |  |  |  | — |  |  |  |  | 357,985 |
Total assets at fair value |  |  |  | 417,127 |  |  |  |  | 43,076 |  |  |  |  | — |  |  |  |  | 460,203 |
Common trust funds (fixed income) |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 298,694 |
Common trust fund (real assets) |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 56,407 |
Total |  | $ |  | 417,127 |  |  | $ |  | 43,076 |  |  | $ |  | — |  |  | $ |  | 815,304 |
|  | December 31, 2019 |
Fair Value Measurements by Asset Category / Fund |  |  | Level 1 |  |  |  | Level 2 |  |  |  | Level 3 |  |  |  | Total |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  | $ |  | 2,574 |  |  | $ |  | — |  |  | $ |  | — |  |  | $ |  | 2,574 |
Total cash and cash equivalents |  |  |  | 2,574 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 2,574 |
Fixed income securities |  |  |  | 23,450 |  |  |  |  | 45,951 |  |  |  |  | — |  |  |  |  | 69,401 |
Mutual fund-fixed income |  |  |  | 34,652 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 34,652 |
Exchange Traded Fund (ETF)-Fixed income |  |  |  | 3,134 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 3,134 |
Total fixed income |  |  |  | 61,236 |  |  |  |  | 45,951 |  |  |  |  | — |  |  |  |  | 107,187 |
Domestic and foreign stock |  |  |  | 88,174 |  |  |  |  |  |  |  |  |  | — |  |  |  |  | 88,174 |
Mutual funds-equity |  |  |  | 236,436 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 236,436 |
Total equity |  |  |  | 324,610 |  |  |  |  |  |  |  |  |  | — |  |  |  |  | 324,610 |
Total assets at fair value |  |  |  | 388,420 |  |  |  |  | 45,951 |  |  |  |  | — |  |  |  |  | 434,371 |
Common trust funds (fixed income) |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 258,572 |
Common trust fund (real assets) |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 59,195 |
Total |  | $ |  | 388,420 |  |  | $ |  | 45,951 |  |  | $ |  | — |  |  | $ |  | 752,138 |
Percentage and Target Allocations | The following table presents the percentage allocation of the plan assets by asset category and corresponding target allocations at December 31, 2020 and 2019.
|  | Plan Assets |  |  |  | Target Allocation
|  | at December 31, |  |  |  | at December 31,
Asset category |  | 2020 |  |  |  | 2019 |  |  |  | 2020 |  | 2019
Cash and equivalents |  |  | 0 |  | % |  |  | 0 |  | % |  | 0 - 5% |  | 0 - 5%
Fixed income securities |  |  | 49 |  |  |  |  | 49 |  |  |  | 41-57% |  | 41-57%
Equity securities |  |  | 44 |  |  |  |  | 43 |  |  |  | 35 - 51% |  | 35 - 51%
Real assets |  |  | 7 |  |  |  |  | 8 |  |  |  | 0 - 12% |  | 0 - 12%
|  |  | 100 |  | % |  |  | 100 |  | % |  |  |  |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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