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Fair Value Measurements of Plan Assets (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) days | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | $ 154,801 | $ 422,255 | $ 389,440
Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Period of Notice Required to Redeem Investments |  | 1 day |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 90.00% |  |
Fixed Income Securities - Russell 14-Year LDI Fixed Income Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Term of Fund |  | 14 years |  |
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Ten Years [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Term of Fund |  | 10 years |  |
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Fifteen Years [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Term of Fund |  | 15 years |  |
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Twenty-Eight Years [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Term of Fund |  | 28 years |  |
Multi-Asset Class Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 10.00% |  |
Multi-Asset Class Fund - Global Equity [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 75.00% |  |
Multi-Asset Class Fund - Marketable Real Assets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 15.00% |  |
Multi-Asset Class Fund - Global Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 10.00% |  |
Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Period of Notice Required to Redeem Investments |  | 1 day |  |
Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Threshold Calendar Days of Notice Required to Redeem Investments | days |  | 110 |  |
Receivables and Accruals Net [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | $ 440 | 1,329 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | 154,361 | 368,011 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [1] | 141,930 | 197,866 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Multi-Asset Class Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [2] | 12,431 |  |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Large-Cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [3] |  | 93,021 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Small- and mid-cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [4] |  | 17,187 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | International Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [5] |  | 59,937 |
Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | 0 | 0 |
Level 1 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [1] | 0 | 0 |
Level 1 [Member] | Multi-Asset Class Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [2] | 0 |  |
Level 1 [Member] | Large-Cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [3] |  | 0 |
Level 1 [Member] | Small- and mid-cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [4] |  | 0 |
Level 1 [Member] | International Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [5] |  | 0 |
Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [6] | 154,361 | 368,011 |
Level 2 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [1],[6] | 141,930 | 197,866 |
Level 2 [Member] | Multi-Asset Class Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [2],[6] | 12,431 |  |
Level 2 [Member] | Large-Cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [3],[6] |  | 93,021 |
Level 2 [Member] | Small- and mid-cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [4],[6] |  | 17,187 |
Level 2 [Member] | International Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [5],[6] |  | 59,937 |
Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | 0 | 0 |
Level 3 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [1] | 0 | 0 |
Level 3 [Member] | Multi-Asset Class Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [2] | $ 0 |  |
Level 3 [Member] | Large-Cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [3] |  | 0 |
Level 3 [Member] | Small- and mid-cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [4] |  | 0 |
Level 3 [Member] | International Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [5] |  | 0 |
Fair Value Measured at Net Asset Value Per Share [Member] | Hedge Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [7] |  | 27,021 |
Fair Value Measured at Net Asset Value Per Share [Member] | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [8] |  | $ 25,894 |
[1] | 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.
[2] | 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.
[3] | 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.
[4] | 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.
[5] | 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.
[6] | 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.
[7] | 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.
[8] | 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.

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