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Pension Plan (Tables) | 12 Months Ended
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Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract] |
Reconciliation of Defined Benefit Pension Plan | The following table shows the reconciliation of the defined benefit pension plan as of December 31, 2017 and 2016:
|  | 2017 |  |  | 2016 |
|  | (000s) |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 109,677 |  |  | $ | 106,839 |
Actual return (loss) on plan assets |  |  | 15,533 |  |  |  | 8,858 |
Benefits paid |  |  | (5,846 | ) |  |  | (5,651 | )
Administrative expenses |  |  | (697 | ) |  |  | (369 | )
Fair value of plan assets at end of year |  | $ | 118,667 |  |  | $ | 109,677 |
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 110,949 |  |  | $ | 118,180 |
Service cost |  |  | 721 |  |  |  | 926 |
Interest cost |  |  | 4,465 |  |  |  | 4,997 |
Benefits paid |  |  | (5,846 | ) |  |  | (5,651 | )
Actuarial (gain) loss |  |  | 5,767 |  |  |  | (7,503 | )
Benefit obligation at end of year |  | $ | 116,056 |  |  | $ | 110,949 |
Amounts recognized in the Consolidated Balance Sheet: |  |  |  |  |  |  |  |
Other non-current assets |  |  | 2,611 |  |  |  |  |
Other non-current liabilities |  |  |  |  |  |  | 1,272 |
Total amounts recognized at end of year |  | $ | 2,611 |  |  | $ | 1,272 |
Components of Net Periodic Pension Cost (Benefit) |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (000s) |
Components of net periodic cost (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 721 |  |  | $ | 926 |  |  | $ | 1,051 |
Interest cost |  |  | 4,465 |  |  |  | 4,997 |  |  |  | 4,912 |
Expected return on plan assets |  |  | (5,862 | ) |  |  | (5,708 | ) |  |  | (6,254 | )
Amortization of actuarial loss |  |  | 863 |  |  |  | 3,072 |  |  |  | 3,164 |
Net periodic cost |  | $ | 187 |  |  | $ | 3,287 |  |  | $ | 2,873 |
Measurement Dates |
|  | 2017 |  | 2016
Measurement Dates |  |  |  |
Benefit obligations |  | 12/31/2017 |  | 12/31/2016
Fair value of plan assets |  | 12/31/2017 |  | 12/31/2016
Weighted-average Assumptions for Net Periodic Benefit Cost |
|  | 2017 |  |  | 2016 |
Weighted average assumptions as of December 31 |  |  |  |  |  |  |  |
Discount rate |  |  | 3.60 | % |  |  | 4.14 | %
Rate of compensation increase |  |  | 4.00 | % |  |  | 4.00 | %
Weighted Average Assumptions |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted-average assumptions for net periodic benefit cost calculations |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 4.14 | % |  |  | 4.34 | % |  |  | 3.95 | %
Expected long-term rate of return on plan assets |  |  | 5.50 | % |  |  | 5.50 | % |  |  | 5.50 | %
Rate of compensation increase |  |  | 4.00 | % |  |  | 4.00 | % |  |  | 4.00 | %
Market Values of Our Pension Plan Assets | The market values of our pension plan assets at December 31, 2017 and December 31, 2016, reported using net asset value as a practical expedient, by asset category are as follows:
|  | 2017 |  |  | 2016 |
Equities: |  |  |  |  |  |  |  |
U.S. Large Cap |  | $ | 9,393 |  |  | $ | 8,547 |
U.S. Mid Cap |  |  | 2,937 |  |  |  | 2,651 |
U.S. Small Cap |  |  | 3,005 |  |  |  | 2,669 |
International Developed |  |  | 7,213 |  |  |  | 6,534 |
Emerging Markets |  |  | 4,792 |  |  |  | 4,360 |
Fixed income: |  |  |  |  |  |  |  |
Core Fixed Income |  |  | 25,915 |  |  |  | 23,719 |
Long Duration Fixed Income |  |  | 62,522 |  |  |  | 58,312 |
Real Estate: |  |  |  |  |  |  |  |
REIT Fund |  |  | 2,370 |  |  |  | 2,216 |
Cash/Currency: |  |  |  |  |  |  |  |
Cash Equivalents |  |  | 520 |  |  |  | 669 |
Total market value |  | $ | 118,667 |  |  | $ | 109,677 |
Estimated Future Benefit | There will be benefit payments under this plan beyond 2027.
Estimated Future Benefit Payments (000s) |  |  |  |
2018 |  | $ | 6,376 |
2019 |  |  | 6,578 |
2020 |  |  | 6,705 |
2021 |  |  | 6,789 |
2022 |  |  | 6,841 |
2023-2027 |  |  | 34,230 |
Total |  | $ | 67,519 |
Plan Assets |
|  | 2017 |  |  | 2016 |
Plan Assets |  |  |  |  |  |  |  |
Asset Category |  |  |  |  |  |  |  |
Equity securities |  |  | 23 | % |  |  | 23 | %
Fixed income securities |  |  | 75 | % |  |  | 75 | %
Other |  |  | 2 | % |  |  | 2 | %
Total |  |  | 100 | % |  |  | 100 | %
Asset Allocation Policy and Ranges Established in accordance with Overall Risk and Return Objectives of Portfolio | The following asset allocation policy and ranges have been established in accordance with the overall risk and return objectives of the portfolio:
|  | As of 12/31/2017 |  |  | Permitted Range
Total Equity |  |  | 23 | % |  | 10-30%
Total Fixed Income |  |  | 75 | % |  | 70-90%
Other |  |  | 2 | % |  | 0-10%

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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=82843861&loc=d3e1928-114920 + Details
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