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Retirement and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |
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
|  | 2015 |  | 2014
|  | (thousands)
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ | 513,798 |  |  | $ | 443,313 |
Service cost |  | 739 |  |  | 1,682 |
Interest cost |  | 19,067 |  |  | 20,179 |
Actuarial (gain) loss |  | (27,817 | ) |  | 82,090 |
Benefits paid (a) |  | (21,708 | ) |  | (33,466 | )
Benefit obligation at end of year |  | 484,079 |  |  | 513,798 |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 363,959 |  |  | 357,280 |
Actual return on plan assets |  | 2,954 |  |  | 28,074 |
Employer contributions |  | 54,257 |  |  | 12,071 |
Benefits paid (a) |  | (21,708 | ) |  | (33,466 | )
Fair value of plan assets at end of year |  | 399,462 |  |  | 363,959 |
Underfunded status |  | $ | (84,617 | ) |  | $ | (149,839 | )
Amounts recognized on our Consolidated Balance Sheets |  |  |  |
Current liabilities |  | $ | (2,510 | ) |  | $ | (2,978 | )
Noncurrent liabilities |  | (82,107 | ) |  | (146,861 | )
Net liability |  | $ | (84,617 | ) |  | $ | (149,839 | )
Amounts recognized in accumulated other comprehensive loss |  |  |  |
Net actuarial loss |  | $ | 75,801 |  |  | $ | 89,592 |
Prior service cost |  | — |  |  | — |
Net loss recognized |  | $ | 75,801 |  |  | $ | 89,592 |
______________________________________
(a) | Benefits paid during the year ended December 31, 2014 include approximately $15 million of lump-sum cash payments to certain terminated and vested participants in settlement of pension obligations.
Net Periodic Benefit Cost and 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
| 2015 |  | 2014 |  | 2013
| (thousands)
Service cost | $ | 739 |  |  | $ | 1,682 |  |  | $ | 2,686 |
Interest cost | 19,067 |  |  | 20,179 |  |  | 18,626 |
Expected return on plan assets | (22,366 | ) |  | (21,000 | ) |  | (19,829 | )
Amortization of actuarial (gain) loss | 4,884 |  |  | (23 | ) |  | 9,202 |
Amortization of prior service costs and other | — |  |  | — |  |  | 90 |
Plan settlement/curtailment expense | 501 |  |  | — |  |  | 214 |
Net periodic benefit cost | 2,825 |  |  | 838 |  |  | 10,989 |
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |  |  |
Net actuarial (gain) loss | (8,406 | ) |  | 75,016 |  |  | (97,171 | )
Amortization of actuarial gain (loss) | (4,884 | ) |  | 23 |  |  | (9,202 | )
Effect of settlements | (501 | ) |  | — |  |  | — |
Amortization of prior service costs and other | — |  |  | — |  |  | (304 | )
Total recognized in other comprehensive (income) loss | (13,791 | ) |  | 75,039 |  |  | (106,677 | )
Total recognized in net periodic cost and other comprehensive (income) loss | $ | (10,966 | ) |  | $ | 75,877 |  |  | $ | (95,688 | )
Assumptions [Table Text Block] | The following table presents the assumptions used in the measurement of our benefit obligations:
| December 31
| 2015 |  | 2014
Weighted average assumptions |  |  |
Discount rate | 4.05 | % |  | 3.75 | %
Rate of compensation increases (a) | — | % |  | — | %
The following table presents the assumptions used in the measurement of net periodic benefit cost:
|  | December 31
|  | 2015 |  | 2014 |  | 2013
Weighted average assumptions |  |  |  |  |  |  |  |
Discount rate (b) |  | 3.75 | % | / | 3.90 | % |  | 4.65 | % |  | 3.75 | %
Expected long-term rate of return on plan assets (b) |  | 6.15 | % | / | 5.85 | % |  | 6.50 | % |  | 6.50 | %
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. In addition to the salaried benefits being frozen, there are currently no scheduled increases in pension benefit rates applicable to past service covering hourly employees who continue to accrue benefits.
(b) | Prior to the remeasurement of our qualified defined benefit pension plan on May 15, 2015, the discount rate and expected rate of return on plan assets were 3.75% and 6.15%. The discount rate and expected rate of return on plan assets after the May 15, 2015 remeasurement were 3.90% and 5.85%, respectively.
Fair Value Measurements 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, 2015 and 2014:
|  | December 31, 2015
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) (a) |  | Significant Unobservable Inputs (Level 3) |  | Total
|  | (thousands)
Equity securities |  |  |  |  |  |  |  |
Large-cap U.S. equity securities (b) |  | $ | — |  |  | $ | 91,622 |  |  | $ | — |  |  | $ | 91,622 |
Small- and mid-cap U.S. equity securities (c) |  | — |  |  | 16,338 |  |  | — |  |  | 16,338 |
International equity securities (d) |  | — |  |  | 61,414 |  |  | — |  |  | 61,414 |
Fixed-income securities (e) |  | — |  |  | 178,019 |  |  | — |  |  | 178,019 |
Hedge fund (f) |  | — |  |  | 25,566 |  |  | — |  |  | 25,566 |
Real estate (g) |  | — |  |  | — |  |  | 24,906 |  |  | 24,906 |
Total investments at fair value |  | $ | — |  |  | $ | 372,959 |  |  | $ | 24,906 |  |  | 397,865 |
Receivables and accrued expenses, net |  |  |  |  |  |  |  | 1,597 |
Fair value of plan assets |  |  |  |  |  |  |  | $ | 399,462 |
|  | December 31, 2014
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) (a) |  | Significant Unobservable Inputs (Level 3) |  | Total
|  | (thousands)
Equity securities |  |  |  |  |  |  |  |
Large-cap U.S. equity securities (b) |  | $ | — |  |  | $ | 111,599 |  |  | $ | — |  |  | $ | 111,599 |
Small- and mid-cap U.S. equity securities (c) |  | — |  |  | 18,331 |  |  | — |  |  | 18,331 |
International equity securities (d) |  | — |  |  | 73,130 |  |  | — |  |  | 73,130 |
Fixed-income securities (e) |  | — |  |  | 125,706 |  |  | — |  |  | 125,706 |
Hedge fund (f) |  | — |  |  | 16,242 |  |  | — |  |  | 16,242 |
Real estate (g) |  | — |  |  | — |  |  | 17,802 |  |  | 17,802 |
Total investments at fair value |  | $ | — |  |  | $ | 345,008 |  |  | $ | 17,802 |  |  | 362,810 |
Receivables and accrued expenses, net |  |  |  |  |  |  |  | 1,149 |
Fair value of plan assets |  |  |  |  |  |  |  | $ | 363,959 |
_______________________________________
(a) | Equity and fixed-income securities represent common collective trusts managed by Russell Trust Company. The funds are valued at the net asset value (NAV) provided by Russell Trust Company, the administrator of the funds. The NAV is a practical expedient for fair value and is based on the value of the assets owned by the fund, less liabilities at year-end. While the underlying assets are actively traded on an exchange, the funds are not. We have the ability to redeem these equity and fixed-income securities with a one-day notice.
(b) | Invested in the Russell Large Cap U.S. Equity Fund at December 31, 2015 and the Russell Equity I Fund at December 31, 2014. Both funds seek returns that exceed the Russell 1000 Index by investing in large-capitalization stocks of the U.S. stock market. In addition, at December 31, 2015 and 2014, 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.
(c) | 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.
(d) | Invested in the Russell International Fund with Active Currency at December 31, 2015 and 2014, 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, 2015 and 2014, 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. At December 31, 2015 and 2014, investments in emerging markets represent approximately 16% and 23%, respectively, of our international portfolio.
(e) | Invested in the Russell Multi-Manager Bond Fund at December 31, 2015 and 2014. 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. In addition, at December 31, 2015 and 2014, our investments in this category included the Russell Long Duration Fixed Income Fund, 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.
(f) | 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 NAV of the investments as a practical expedient for fair value. We have the ability to redeem these investments at NAV within the near term, and they are thus classified within Level 2.
(g) | Invested in the Russell Real Estate Equity Fund. Real estate investments include those in limited partnerships that invest in various domestic commercial and residential real estate projects. The fair values of real estate assets are typically determined by using income and/or cost approaches or a comparable sales approach, taking into consideration discount and capitalization rates, financial conditions, local market conditions, and the status of the capital markets, and they are thus classified within Level 3. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the underlying assets means that there are inherent difficulties in determining the value of the investments. 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.
Expected Future 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):
2016 |  | $ | 22,796 |
2017 |  | 22,391 |
2018 |  | 23,755 |
2019 |  | 24,879 |
2020 |  | 25,796 |
Years 2021-2025 |  | 138,480 |
Level 3 [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Changes in Fair Value of Level 3 Plan Assets [Table Text Block] | The following table sets forth a summary of changes in the fair value of the pension plans' Level 3 assets for the years ended December 31, 2015 and 2014:
|  | December 31
|  | 2015 |  | 2014
|  | (thousands)
Balance, beginning of year |  | $ | 17,802 |  |  | $ | 16,055 |
Purchases |  | 4,500 |  |  | — |
Unrealized gain |  | 2,604 |  |  | 1,747 |
Balance, end of year |  | $ | 24,906 |  |  | $ | 17,802 |

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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. Also includes tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. + References No definition available. + Details
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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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