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Retirement and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Defined Benefit Obligations and Funded Status [Table Text Block] | The following table, which includes only company-sponsored defined benefit plans, reconciles the beginning and ending balances of our projected benefit obligation and fair value of plan assets. We recognize the underfunded status of our defined benefit pension plans on our Consolidated Balance Sheets. We recognize changes in funded status in the year changes occur through other comprehensive income (loss).
|  | December 31
|  | 2020 |  | 2019
|  | (thousands)
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ | 192,061 |  |  | $ | 176,852 |
Service cost |  | 668 |  |  | 647 |
Interest cost |  | 5,893 |  |  | 7,210 |
Actuarial loss |  | 18,605 |  |  | 29,065 |
Group annuity transactions (a) |  | (76,650) |  |  | (19,848) |
Benefits paid (b) |  | (135,690) |  |  | (1,865) |
Benefit obligation at end of year |  | 4,887 |  |  | 192,061 |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 168,651 |  |  | 154,801 |
Actual return on plan assets |  | 30,930 |  |  | 29,769 |
Employer contributions |  | 12,759 |  |  | 5,238 |
Group annuity transactions (a) |  | (76,650) |  |  | (19,292) |
Benefits paid (b) |  | (135,690) |  |  | (1,865) |
Fair value of plan assets at end of year |  | — |  |  | 168,651 |
Underfunded status |  | $ | (4,887) |  |  | $ | (23,410) |
Amounts recognized on our Consolidated Balance Sheets |  |  |  |
Current liabilities |  | $ | (367) |  |  | $ | (878) |
Noncurrent liabilities |  | (4,520) |  |  | (22,532) |
Net liability |  | $ | (4,887) |  |  | $ | (23,410) |
Amounts recognized in accumulated other comprehensive loss |  |  |  |
Net actuarial loss |  | $ | 1,443 |  |  | $ | 15,332 |
Prior service cost |  | — |  |  | — |
Net loss recognized |  | $ | 1,443 |  |  | $ | 15,332 |
______________________________________ (a) See Defined Benefits Plans above for description of group annuity transactions. (b) See Defined Benefits Plans above for description of lump-sum payments.
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | The components of net periodic benefit cost and other amounts recognized in other comprehensive (income) loss are as follows:
| Year Ended December 31
| 2020 |  | 2019 |  | 2018
| (thousands)
Net periodic benefit cost |  |  |  |  |
Service cost | $ | 668 |  |  | $ | 647 |  |  | $ | 794 |
Interest cost | 5,893 |  |  | 7,210 |  |  | 11,344 |
Expected return on plan assets | (5,493) |  |  | (5,903) |  |  | (11,097) |
Amortization of actuarial (gain) loss | 807 |  |  | (175) |  |  | 1,497 |
Plan settlement expense (a) | 6,250 |  |  | 1,342 |  |  | 23,255 |
Net periodic benefit cost | 8,125 |  |  | 3,121 |  |  | 25,793 |
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |  |  |
Net actuarial (gain) loss | (6,832) |  |  | 4,642 |  |  | (14,178) |
Amortization of actuarial gain (loss) | (807) |  |  | 175 |  |  | (1,497) |
Effect of settlements | (6,250) |  |  | (1,342) |  |  | (23,255) |
Total recognized in other comprehensive (income) loss | (13,889) |  |  | 3,475 |  |  | (38,930) |
Total recognized in net periodic cost and other comprehensive (income) loss | $ | (5,764) |  |  | $ | 6,596 |  |  | $ | (13,137) |
______________________________________ (a) Plan settlement expense during the years ended December 31, 2020, 2019, and 2018 includes $6.3 million, $1.3 million and $23.3 million, respectively, of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts, as well as lump-sum payments in 2020.
Schedule of Net Benefit Costs [Table Text Block] | The components of net periodic benefit cost and other amounts recognized in other comprehensive (income) loss are as follows:
| Year Ended December 31
| 2020 |  | 2019 |  | 2018
| (thousands)
Net periodic benefit cost |  |  |  |  |
Service cost | $ | 668 |  |  | $ | 647 |  |  | $ | 794 |
Interest cost | 5,893 |  |  | 7,210 |  |  | 11,344 |
Expected return on plan assets | (5,493) |  |  | (5,903) |  |  | (11,097) |
Amortization of actuarial (gain) loss | 807 |  |  | (175) |  |  | 1,497 |
Plan settlement expense (a) | 6,250 |  |  | 1,342 |  |  | 23,255 |
Net periodic benefit cost | 8,125 |  |  | 3,121 |  |  | 25,793 |
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |  |  |
Net actuarial (gain) loss | (6,832) |  |  | 4,642 |  |  | (14,178) |
Amortization of actuarial gain (loss) | (807) |  |  | 175 |  |  | (1,497) |
Effect of settlements | (6,250) |  |  | (1,342) |  |  | (23,255) |
Total recognized in other comprehensive (income) loss | (13,889) |  |  | 3,475 |  |  | (38,930) |
Total recognized in net periodic cost and other comprehensive (income) loss | $ | (5,764) |  |  | $ | 6,596 |  |  | $ | (13,137) |
______________________________________ (a) Plan settlement expense during the years ended December 31, 2020, 2019, and 2018 includes $6.3 million, $1.3 million and $23.3 million, respectively, of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts, as well as lump-sum payments in 2020.
Schedule of Assumptions Used [Table Text Block] | The following table presents the assumptions used in the measurement of our benefit obligations:
| December 31
| 2020 |  | 2019
Weighted average assumptions |  |  |
Discount rate | 2.00 | % |  | 3.10 | %
Rate of compensation increases (a) | — | % |  | — | %
The following table presents the assumptions used in the measurement of net periodic benefit cost:
|  | December 31
|  | 2020 |  | 2019 |  | 2018 (b) |  |
Weighted average assumptions |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 3.10 | % |  | 4.15 | % |  | 3.95 | % | / | 4.05 | % | / | 3.40 | % |  |  |
Expected long-term rate of return on plan assets |  | 3.50 | % |  | 3.85 | % |  | 3.85 | % | / | 4.50 | % | / | 4.75 | % |  |  |
Rate of compensation increases (a) |  | — | % |  | — | % |  |  |  |  |  | — | % |  |
_______________________________________ (a) Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero. (b) Prior to the remeasurements of our qualified defined benefit pension plan on April 25, 2018, and August 10, 2018, the discount rates were 3.40% and 4.05%, respectively, and the expected rates of return on plan assets were 4.75% and 4.50%, respectively. The discount rate and expected rate of return on plan assets after the August 10, 2018 remeasurement were 3.95% and 3.85%, respectively.
Schedule of Allocation of Plan Assets [Table Text Block] | The following table sets forth by level, within the fair value hierarchy, the pension plan assets, by major asset category, at fair value at December 31, 2019:
|  | December 31, 2019
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) (a) |  | Significant Unobservable Inputs (Level 3) |  | Total
|  | (thousands)
Fixed-income securities (b) |  | $ | — |  |  | $ | 152,530 |  |  | $ | — |  |  | $ | 152,530 |
Multi-asset class fund (c) |  | — |  |  | 16,361 |  |  | — |  |  | 16,361 |
Total investments at fair value |  | $ | — |  |  | $ | 168,891 |  |  | $ | — |  |  | 168,891 |
Receivables and accrued expenses, net |  |  |  |  |  |  |  | (240) |
Fair value of plan assets |  |  |  |  |  |  |  | $ | 168,651 |
_______________________________________ (a)Securities represent common collective trusts managed and valued by Russell Trust Company, the administrator of the funds. While the underlying assets are actively traded on an exchange, the funds are not. The investments in equity and fixed-income securities are considered to have a readily determinable fair value because the fair value per share (unit) is determined and published and is the basis for current transactions. We had the ability to redeem these securities with a 1 day notice. (b)Invested in the Russell Long Duration Fixed Income Fund, which is designed to provide current income and capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield, emerging market bonds and other non-index securities. In addition, our investments in this category included the Russell 14 Year LDI Fixed Income Fund. We also were invested in the Russell 8 Year LDI Fixed Income Fund. These LDI funds invest primarily in investment grade bonds that closely match those found in discount rate curves used to value U.S. pension liabilities and seeks to provide additional incremental return through modest interest rate timing, security selection, and tactical use of non-credit sectors. In addition, our investments in this category included Russell STRIPS Fixed Income Funds with duration profiles of 10, 15, and 28 years. These funds invest in a subset of the STRIPS universe with a similar duration profile as their respective Bloomberg Barclays U.S. STRIPS Index. (c)Invested in the Russell Multi-Asset Core Plus Fund, which is designed to provide long-term growth by providing a diversified portfolio of investments that has an overall strategic allocation of 75% global equity, 15% marketable real assets, and 10% global fixed income.
Schedule of Expected Benefit Payments [Table Text Block] | Nonqualified pension benefit payments are paid by the company. The following benefit payments are expected to be paid to nonqualified plan participants (in thousands):
2021 |  | $ | 367 |
2022 |  | 380 |
2023 |  | 382 |
2024 |  | 368 |
2025 |  | 314 |
Years 2026-2030 |  | 1,373 |

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