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Fair Value Measurements of Plan Assets (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) days | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | $ 422,255 | $ 389,440 | $ 399,462
Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 41.00% |  |
Period of Notice Required to Redeem Investments |  | 1 day |  |
Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 47.00% |  |
Period of Notice Required to Redeem Investments |  | 1 day |  |
Hedge Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 6.00% |  |
Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 6.00% |  |
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 |  | $ 1,329 | 1,293 |
Fair Value Inputs Level 1, 2, and 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | 368,011 | 338,061 |
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 | [1] | 93,021 | 88,686 |
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 | [2] | 17,187 | 16,021 |
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 | [3] | 59,937 | 59,675 |
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 | [4] | 197,866 | 173,679 |
Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | 0 | 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 | [1] | 0 | 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 | [2] | 0 | 0 |
Level 1 [Member] | International Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [3] | 0 | 0 |
Level 1 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [4] | 0 | 0 |
Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | 368,011 | 338,061 |
Level 2 [Member] | Large-Cap U.S. equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [1],[5] | 93,021 | 88,686 |
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 | [2],[5] | 17,187 | 16,021 |
Level 2 [Member] | International Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [3],[5] | 59,937 | 59,675 |
Level 2 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [4],[5] | 197,866 | 173,679 |
Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  | 0 | 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 | [1] | 0 | 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 | [2] | 0 | 0 |
Level 3 [Member] | International Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [3] | 0 | 0 |
Level 3 [Member] | Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | [4] | 0 | 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 | [6] | 27,021 | 25,823 |
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 | [7] | $ 25,894 | $ 24,263 |
[1] | Invested in the Russell Large Cap U.S. Equity Fund at December 31, 2017 and 2016. The fund seeks returns that exceed the Russell 1000 Index by investing in large-capitalization stocks of the U.S. stock market. In addition, at December 31, 2017 and 2016, 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.
[2] | 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.
[3] | Invested in the Russell International Fund with Active Currency at December 31, 2017 and 2016, 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, at December 31, 2017 and 2016, 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.
[4] | Invested in the Russell Long Duration Fixed Income Fund at December 31, 2017 and 2016, which is designed to provide maximum total return 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, 2017 and 2016, our investments in this category 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.
[5] | Equity and fixed-income 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 equity and fixed-income securities with a one-day notice.
[6] | 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.
[7] | 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. In November 2017, the RFIC provided notice to Russell to liquidate our position in the real estate fund and expects to transition the available proceeds to fixed-income securities early in second quarter 2018.

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