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Retirement and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
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.
|  | December 31
|  | 2018 |  | 2017
|  | (thousands)
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ | 483,525 |  |  | $ | 460,192 |
Service cost |  | 794 |  |  | 1,204 |
Interest cost |  | 11,344 |  |  | 17,542 |
Actuarial (gain) loss |  | (39,651 | ) |  | 26,112 |
Group annuity transactions (a) |  | (265,137 | ) |  | — |
Benefits paid |  | (14,023 | ) |  | (21,525 | )
Benefit obligation at end of year |  | 176,852 |  |  | 483,525 |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 422,255 |  |  | 389,440 |
Actual return on plan assets |  | (3,968 | ) |  | 52,147 |
Employer contributions |  | 26,081 |  |  | 2,193 |
Group annuity transactions (a) |  | (275,544 | ) |  | — |
Benefits paid |  | (14,023 | ) |  | (21,525 | )
Fair value of plan assets at end of year |  | 154,801 |  |  | 422,255 |
Underfunded status |  | $ | (22,051 | ) |  | $ | (61,270 | )
Amounts recognized on our Consolidated Balance Sheets |  |  |  |
Current liabilities |  | $ | (671 | ) |  | $ | (715 | )
Noncurrent liabilities |  | (21,380 | ) |  | (60,555 | )
Net liability |  | $ | (22,051 | ) |  | $ | (61,270 | )
Amounts recognized in accumulated other comprehensive loss |  |  |  |
Net actuarial loss |  | $ | 11,856 |  |  | $ | 50,787 |
Prior service cost |  | — |  |  | — |
Net loss recognized |  | $ | 11,856 |  |  | $ | 50,787 |
______________________________________
(a) | See Defined Benefits Plans above for description of group annuity transactions.
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 are as follows:
| Year Ended December 31
| 2018 |  | 2017 |  | 2016
| (thousands)
Net periodic benefit cost |  |  |  |  |
Service cost | $ | 794 |  |  | $ | 1,204 |  |  | $ | 1,127 |
Interest cost | 11,344 |  |  | 17,542 |  |  | 18,798 |
Expected return on plan assets | (11,097 | ) |  | (18,968 | ) |  | (20,324 | )
Amortization of actuarial loss | 1,497 |  |  | 1,686 |  |  | 2,484 |
Plan settlement expense (a) | 23,255 |  |  | — |  |  | 4,155 |
Net periodic benefit cost | 25,793 |  |  | 1,464 |  |  | 6,240 |
Changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |  |
Net actuarial gain | (14,178 | ) |  | (7,067 | ) |  | (9,622 | )
Amortization of actuarial loss | (1,497 | ) |  | (1,686 | ) |  | (2,484 | )
Effect of settlements | (23,255 | ) |  | — |  |  | (4,155 | )
Total recognized in other comprehensive income | (38,930 | ) |  | (8,753 | ) |  | (16,261 | )
Total recognized in net periodic cost and other comprehensive income | $ | (13,137 | ) |  | $ | (7,289 | ) |  | $ | (10,021 | )
______________________________________
(a) | Plan settlement expense during the year ended December 31, 2018 includes $23.3 million of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts. Plan settlement expense during the year ended December 31, 2016 includes a $3.9 million settlement charge related to lump-sum cash payments to certain terminated vested participants in settlement of pension obligations.
Schedule of Net Benefit Costs [Table Text Block] | The components of net periodic benefit cost and other amounts recognized in other comprehensive income are as follows:
| Year Ended December 31
| 2018 |  | 2017 |  | 2016
| (thousands)
Net periodic benefit cost |  |  |  |  |
Service cost | $ | 794 |  |  | $ | 1,204 |  |  | $ | 1,127 |
Interest cost | 11,344 |  |  | 17,542 |  |  | 18,798 |
Expected return on plan assets | (11,097 | ) |  | (18,968 | ) |  | (20,324 | )
Amortization of actuarial loss | 1,497 |  |  | 1,686 |  |  | 2,484 |
Plan settlement expense (a) | 23,255 |  |  | — |  |  | 4,155 |
Net periodic benefit cost | 25,793 |  |  | 1,464 |  |  | 6,240 |
Changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |  |
Net actuarial gain | (14,178 | ) |  | (7,067 | ) |  | (9,622 | )
Amortization of actuarial loss | (1,497 | ) |  | (1,686 | ) |  | (2,484 | )
Effect of settlements | (23,255 | ) |  | — |  |  | (4,155 | )
Total recognized in other comprehensive income | (38,930 | ) |  | (8,753 | ) |  | (16,261 | )
Total recognized in net periodic cost and other comprehensive income | $ | (13,137 | ) |  | $ | (7,289 | ) |  | $ | (10,021 | )
______________________________________
(a) | Plan settlement expense during the year ended December 31, 2018 includes $23.3 million of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts. Plan settlement expense during the year ended December 31, 2016 includes a $3.9 million settlement charge related to lump-sum cash payments to certain terminated vested participants in settlement of pension obligations.
Schedule of Assumptions Used [Table Text Block] | The following table presents the assumptions used in the measurement of our benefit obligations:
| December 31
| 2018 |  | 2017
Weighted average assumptions |  |  |
Discount rate | 4.15 | % |  | 3.40 | %
Rate of compensation increases (c) | — | % |  | — | %
The following table presents the assumptions used in the measurement of net periodic benefit cost:
|  | December 31
|  | 2018 |  | 2017 |  | 2016
Weighted average assumptions |  |  |  |  |  |  |  |  |  |  |  |
Discount rate (a)(b) |  | 3.95 | % | / | 4.05 | % | / | 3.40 | % |  | 3.90 | % |  | 3.45 | % | / | 4.05 | %
Expected long-term rate of return on plan assets (a)(b) |  | 3.85 | % | / | 4.50 | % | / | 4.75 | % |  | 5.00 | % |  | 5.10 | % | / | 5.10 | %
Rate of compensation increases (c) |  | — | % |  | — | % |  | — | %
_______________________________________
(a) | 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.
(b) | Prior to the remeasurement of our qualified defined benefit pension plan on November 1, 2016, the discount rate and expected rate of return on plan assets were 4.05% and 5.10%. The discount rate and expected rate of return on plan assets after the November 1, 2016 remeasurement were 3.45% and 5.10%, respectively.
(c) | Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero. In addition to the salaried benefits being frozen, there are currently no scheduled increases in pension benefit rates applicable to past service covering the minimal number of hourly employees who continue to accrue benefits.
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, 2018 and 2017:
|  | December 31, 2018
|  | 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) |  | $ | — |  |  | $ | 141,930 |  |  | $ | — |  |  | $ | 141,930 |
Multi-asset class fund (c) |  | — |  |  | 12,431 |  |  | — |  |  | 12,431 |
Total investments at fair value |  | $ | — |  |  | $ | 154,361 |  |  | $ | — |  |  | 154,361 |
Receivables and accrued expenses, net |  |  |  |  |  |  |  | 440 |
Fair value of plan assets |  |  |  |  |  |  |  | $ | 154,801 |
|  | December 31, 2017
|  | 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) |  | $ | — |  |  | $ | 197,866 |  |  | $ | — |  |  | $ | 197,866 |
Equity securities |  |  |  |  |  |  |  |
Large-cap U.S. equity securities (d) |  | — |  |  | 93,021 |  |  | — |  |  | 93,021 |
Small- and mid-cap U.S. equity securities (e) |  | — |  |  | 17,187 |  |  | — |  |  | 17,187 |
International equity securities (f) |  | — |  |  | 59,937 |  |  | — |  |  | 59,937 |
Total investments at fair value |  | $ | — |  |  | $ | 368,011 |  |  | $ | — |  |  | 368,011 |
Hedge fund measured at NAV (g) |  |  |  |  |  |  |  | 27,021 |
Real estate fund measured at NAV (h) |  |  |  |  |  |  |  | 25,894 |
Receivables and accrued expenses, net |  |  |  |  |  |  |  | 1,329 |
Fair value of plan assets |  |  |  |  |  |  |  | $ | 422,255 |
_______________________________________
(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 have the ability to redeem these securities with a one-day notice.
(b) | Invested in the Russell Long Duration Fixed Income Fund at December 31, 2018 and 2017, 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, at December 31, 2018, our investments in this category included the Russell 14-Year LDI Fixed Income Fund. The fund invests 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, at December 31, 2018, 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. Lastly, at December 31, 2017, our investments in this category also included the Russell Multi-Manager Bond Fund. The fund seeks to outperform the Barclays Capital U.S. Aggregate Bond Index over a full market cycle. The fund is designed to provide current income and, as a secondary objective, capital appreciation through a variety of diversified strategies, including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield and emerging market bonds.
(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.
(d) | Invested in the Russell Large Cap U.S. Equity Fund. The fund seeks returns that exceed the Russell 1000 Index by investing in large-capitalization stocks of the U.S. stock market. In addition, our investments in this category included the Russell 1000 Index Fund, which seeks to track the investment results of an index composed of large- and mid-capitalization stocks of the U.S. stock market.
(e) | Invested in the Russell Equity II Fund. The fund seeks returns that exceed the Russell 2500 Index by investing in the small- and mid-capitalization stocks of the U.S. stock market.
(f) | Invested in the Russell International Fund with Active Currency, which benchmarks against the Russell Developed ex-U.S. Large Cap Index Net and seeks favorable total returns and additional diversification through investment in non-U.S. equity securities and active currency management. The fund participates primarily in the stock markets of Europe and the Pacific Rim and seeks to opportunistically add value through active investment in foreign currencies. In addition, our investments in this category included the Russell Emerging Market Fund, which benchmarks against the Russell Emerging Markets Index and is designed to maintain a broadly diversified exposure to emerging market countries.
(g) | Invested in the AQR Delta Offshore Fund. The fund seeks to produce high risk-adjusted returns while targeting a low long-term average correlation to traditional markets. The fund invests internationally in a broad range of instruments, including, but not limited to, equities, currencies, convertible securities, futures, forwards, options, swaps, and other derivative products. The fair value of the hedge fund is estimated using the net asset value (NAV) of the investment as a practical expedient for fair value. We have the ability to redeem these investments at NAV within the near term. The fund is classified outside the fair value hierarchy tables because fair value is measured using the NAV per share practical expedient.
(h) | Invested in the Russell Real Estate Equity Fund. The fund seeks to obtain favorable total return through income and growth, and to outperform the NCREIF Open-End Diversified Core Equity Fund Index - Equal Weight. Real estate investments include those in limited partnerships, limited liability companies, and real estate investment trusts consisting of private real estate investments including office, apartment, retail, industrial, and other commercial properties. The fair value of the real estate fund is estimated using NAV of the investment as a practical expedient for fair value. Amounts realized on the sale of these investments may differ from the calculated values. We have the ability to redeem the real estate investments with a 110-calendar-day written notice prior to a quarterly trade date. The fund is classified outside the fair value hierarchy tables because fair value is measured using the NAV per share practical expedient.
Schedule of Expected Benefit Payments [Table Text Block] | Qualified pension benefit payments are paid from plan assets, while nonqualified pension benefit payments are paid by the company. The following benefit payments are expected to be paid to plan participants (in thousands):
2019 |  | $ | 3,129 |
2020 |  | 4,191 |
2021 |  | 5,368 |
2022 |  | 6,393 |
2023 |  | 7,271 |
Years 2024-2028 |  | 46,610 |

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