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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Components of net periodic benefit cost | The following tables 11.1, 11.2, and 11.3 provide the components of aggregate annual net periodic benefit cost for each of the years ended December 31, 2017, 2016, and 2015 and changes in the benefit obligation and the funded status of the pension, supplemental executive retirement and other postretirement benefit plans as recognized in the consolidated balance sheets as of December 31, 2017 and 2016.
| Table | 11.1 |  |  |  |  |  |  |  |  |  |  |  |
Components of net periodic benefit cost |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(in thousands) |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015
| 1. Company Service Cost |  | $ | 9,556 |  |  | $ | 9,130 |  |  | $ | 10,256 |  |  | $ | 813 |  |  | $ | 751 |  |  | $ | 833 |
| 2. Interest Cost |  | 15,475 |  |  | 15,906 |  |  | 15,847 |  |  | 706 |  |  | 704 |  |  | 697 |
| 3. Expected Return on Assets |  | (20,099 | ) |  | (19,508 | ) |  | (21,109 | ) |  | (5,248 | ) |  | (4,886 | ) |  | (4,991 | )
| 4. Other Adjustments |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Subtotal |  | 4,932 |  |  | 5,528 |  |  | 4,994 |  |  | (3,729 | ) |  | (3,431 | ) |  | (3,461 | )
| 5. Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| a. Net Transition Obligation/(Asset) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| b. Net Prior Service Cost/(Credit) |  | (426 | ) |  | (687 | ) |  | (845 | ) |  | (6,649 | ) |  | (6,649 | ) |  | (6,649 | )
| c. Net Losses/(Gains) |  | 6,169 |  |  | 5,856 |  |  | 5,485 |  |  | — |  |  | — |  |  | (175 | )
| Total Amortization |  | 5,743 |  |  | 5,169 |  |  | 4,640 |  |  | (6,649 | ) |  | (6,649 | ) |  | (6,824 | )
| 6. Net Periodic Benefit Cost |  | 10,675 |  |  | 10,697 |  |  | 9,634 |  |  | (10,378 | ) |  | (10,080 | ) |  | (10,285 | )
| 7. Cost of settlements |  | — |  |  | 1,277 |  |  | 3,172 |  |  | — |  |  | — |  |  | — |
| 8. Total Expense for Year |  | $ | 10,675 |  |  | $ | 11,974 |  |  | $ | 12,806 |  |  | $ | (10,378 | ) |  | $ | (10,080 | ) |  | $ | (10,285 | )
Development of funded status |
| Table | 11.2 |  |  |  |  |  |  |  |
Development of funded status |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
| (in thousands) |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016
| Actuarial Value of Benefit Obligations |  |  |  |  |  |  |  |
| 1. Measurement Date |  | 12/31/2017 |  |  | 12/31/2016 |  |  | 12/31/2017 |  |  | 12/31/2016 |
| 2. Accumulated Benefit Obligation |  | $ | 411,996 |  |  | $ | 360,423 |  |  | $ | 24,716 |  |  | $ | 17,378 |
| Funded Status/Asset (Liability) on the Consolidated Balance Sheet |  |  |  |  |  |  |  |
| 1. Projected Benefit Obligation |  | $ | (417,770 | ) |  | $ | (369,808 | ) |  | $ | (24,716 | ) |  | $ | (17,378 | )
| 2. Plan Assets at Fair Value |  | 401,142 |  |  | 360,900 |  |  | 85,303 |  |  | 70,408 |
| 3. Funded Status - Overfunded/Asset |  | N/A |  |  | N/A |  |  | $ | 60,587 |  |  | $ | 53,030 |
| 4. Funded Status - Underfunded/Liability |  | (16,628 | ) |  | (8,908 | ) |  | N/A |  |  | N/A |
| Table | 11.3 |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(in thousands) |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016
1. Net Actuarial (Gain)/Loss |  | $ | 109,904 |  |  | $ | 103,861 |  |  | $ | (10,234 | ) |  | $ | (6,088 | )
| 2. Net Prior Service Cost/(Credit) |  | (1,850 | ) |  | (2,286 | ) |  | (5,342 | ) |  | (11,991 | )
| 3. Net Transition Obligation/(Asset) |  | — |  |  | — |  |  | — |  |  | — |
| 4. Total at Year End |  | $ | 108,054 |  |  | $ | 101,575 |  |  | $ | (15,576 | ) |  | $ | (18,079 | )
Change in projected benefit obligation | Table 11.4 shows the changes in the projected benefit obligation for 2017 and 2016.
| Table | 11.4 |  |  |  |  |  |  |  |
Change in projected benefit / accumulated benefit obligation |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(in thousands) |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016
1. Benefit Obligation at Beginning of Year |  | $ | 369,808 |  |  | $ | 349,483 |  |  | $ | 17,378 |  |  | $ | 16,423 |
| 2. Company Service Cost |  | 9,556 |  |  | 9,130 |  |  | 813 |  |  | 751 |
| 3. Interest Cost |  | 15,475 |  |  | 15,906 |  |  | 706 |  |  | 704 |
| 4. Plan Participants' Contributions |  | — |  |  | — |  |  | 395 |  |  | 408 |
| 5. Net Actuarial (Gain)/Loss due to Assumption Changes |  | 38,496 |  |  | 14,450 |  |  | 5,981 |  |  | 497 |
| 6. Net Actuarial (Gain)/Loss due to Plan Experience |  | 2,338 |  |  | 5,428 |  |  | 924 |  |  | 357 |
| 7. Benefit Payments from Fund (1) |  | (17,578 | ) |  | (21,831 | ) |  | (1,404 | ) |  | (1,678 | )
| 8. Benefit Payments Directly by Company |  | (335 | ) |  | (2,669 | ) |  | — |  |  | — |
| 9. Plan Amendments |  | 10 |  |  | 16 |  |  | — |  |  | — |
| 10. Other Adjustment |  | — |  |  | (105 | ) |  | (77 | ) |  | (84 | )
| 11. Benefit Obligation at End of Year |  | $ | 417,770 |  |  | $ | 369,808 |  |  | $ | 24,716 |  |  | $ | 17,378 |
(1) | Includes lump sum payments of $6.3 million and $11.2 million in 2017 and 2016, respectively, from our pension plan to eligible participants, which were former employees with vested benefits.
Change in plan assets | Tables 11.5 and 11.6 shows the changes in the fair value of the net assets available for plan benefits, and changes in other comprehensive income (loss) during 2017 and 2016.
| Table | 11.5 |  |  |  |  |  |  |  |
Change in plan assets |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
| (in thousands) |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016
| 1. Fair Value of Plan Assets at Beginning of Year |  | $ | 360,900 |  |  | $ | 350,107 |  |  | $ | 70,408 |  |  | $ | 65,568 |
| 2. Company Contributions |  | 9,435 |  |  | 11,369 |  |  | — |  |  | — |
| 3. Plan Participants' Contributions |  | — |  |  | — |  |  | 395 |  |  | 408 |
| 4. Benefit Payments from Fund |  | (17,578 | ) |  | (21,831 | ) |  | (1,404 | ) |  | (1,678 | )
| 5. Benefit Payments paid directly by Company |  | (335 | ) |  | (2,669 | ) |  | — |  |  | — |
| 6. Actual Return on Assets |  | 48,720 |  |  | 23,924 |  |  | 16,299 |  |  | 6,518 |
| 7. Other Adjustment |  | — |  |  | — |  |  | (395 | ) |  | (408 | )
| 8. Fair Value of Plan Assets at End of Year |  | $ | 401,142 |  |  | $ | 360,900 |  |  | $ | 85,303 |  |  | $ | 70,408 |
Change in accumulated other comprehensive income (AOCI) |
| Table | 11.6 |  |  |  |  |  |  |  |
Change in accumulated other comprehensive income (loss) ("AOCI") |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(in thousands) |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016
1. AOCI in Prior Year |  | $ | 101,575 |  |  | $ | 92,647 |  |  | $ | (18,079 | ) |  | $ | (23,951 | )
2. Increase/(Decrease) in AOCI |  |  |  |  |  |  |  |  |  |  |  |
| a. Recognized during year - Prior Service (Cost)/Credit |  | 426 |  |  | 687 |  |  | 6,649 |  |  | 6,649 |
| b. Recognized during year - Net Actuarial (Losses)/Gains |  | (6,169 | ) |  | (5,856 | ) |  | — |  |  | — |
| c. Occurring during year - Prior Service Cost |  | 10 |  |  | 16 |  |  | — |  |  | — |
| d. Occurring during year - Net Actuarial Losses/(Gains) |  | 12,212 |  |  | 15,358 |  |  | (4,146 | ) |  | (777 | )
| e. Occurring during year - Net Settlement Losses/(Gains) |  | — |  |  | (1,277 | ) |  | — |  |  | — |
| f. Other adjustments |  | — |  |  | — |  |  | — |  |  | — |
| 3. AOCI in Current Year |  | $ | 108,054 |  |  | $ | 101,575 |  |  | $ | (15,576 | ) |  | $ | (18,079 | )
Amortizations expected to be recognized during next fiscal year | Table 11.7 shows the amount of amortization on components of net periodic benefit costs expected to be recognized during the year ending December 31, 2018.
| Table | 11.7 |  |  |  |
Amortization expected to be recognized during next fiscal year ending |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2018 |  | 12/31/2018
1. Amortization of Net Transition Obligation/(Asset) |  | $ | — |  |  | $ | — |
| 2. Amortization of Prior Service Cost/(Credit) |  | (349 | ) |  | (4,104 | )
| 3. Amortization of Net Losses/(Gains) |  | 7,140 |  |  | (183 | )
Actuarial assumptions | The projected benefit obligations, net periodic benefit costs and accumulated postretirement benefit obligation for the plans were determined using the following weighted average assumptions.
| Table | 11.8 |  |  |  |  |  |  |  |
Actuarial assumptions |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
|  |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016
| Weighted-Average Assumptions Used to Determine |  |  |  |  |  |  |  |
| Benefit Obligations at year end |  |  |  |  |  |  |  |
| 1. Discount Rate |  | 3.75 | % |  | 4.30 | % |  | 3.55 | % |  | 3.95 | %
| 2. Rate of Compensation Increase |  | 3.00 | % |  | 3.00 | % |  | N/A |  |  | N/A |
| Weighted-Average Assumptions Used to Determine |  |  |  |  |  |  |  |  |  |  |  |
| Net Periodic Benefit Cost for Year |  |  |  |  |  |  |  |  |  |  |  |
| 1. Discount Rate |  | 4.30 | % |  | 4.65 | % |  | 3.95 | % |  | 4.30 | %
| 2. Expected Long-term Return on Plan Assets |  | 5.75 | % |  | 5.75 | % |  | 7.50 | % |  | 7.50 | %
| 3. Rate of Compensation Increase |  | 3.00 | % |  | 3.00 | % |  | N/A |  |  | N/A |
| Assumed Health Care Cost Trend Rates at year end |  |  |  |  |  |  |  |  |  |  |  |
| 1. Health Care Cost Trend Rate Assumed for Next Year |  | N/A |  |  | N/A |  |  | 6.50 | % |  | 6.50 | %
| 2. Rate to Which the Cost Trend Rate is Assumed to Decline (Ultimate Trend Rate) |  | N/A |  |  | N/A |  |  | 5.00 | % |  | 5.00 | %
| 3. Year That the Rate Reaches the Ultimate Trend Rate |  | N/A |  |  | N/A |  |  | 2024 |  |  | 2020 |
Year-end asset allocations of the plans | The year-end asset allocations of the plans are shown in table 11.9 below.
| Table | 11.9 |  |  |  |  |  |  |  |
Plan assets |  |  | Pension Plan |  | Other Postretirement Benefits
|  |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016
| 1. Equity Securities |  | 21 | % |  | 23 | % |  | 100 | % |  | 100 | %
| 2. Debt Securities |  | 79 | % |  | 77 | % |  | — | % |  | — | %
| 3. Total |  | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Schedule of investment allocation strategies | The equity investments utilize combinations of mutual funds, ETFs, and pooled equity account structures focused on the following strategies:
Strategy |  | Objective |  | Investment types
Return seeking growth |  | Funded ratio improvement over the long term |  | ● | Global quality growth
|  | ● | Global low volatility
Return seeking bridge |  | Downside protection in the event of a declining equity market |  | ● | Enduring asset
|  | ● | Durable company
Minimum and maximum allocation ranges for fixed income securities and equity securities | The primary focus in developing asset allocation ranges for the portfolio is the assessment of the portfolio's investment objectives and the level of risk that is acceptable to obtain those objectives. To achieve these objectives the minimum and maximum allocation ranges for fixed income securities and equity securities are:
| Minimum |  | Maximum
Equities (long only) | 70 | % |  | 100 | %
Real estate | 0 | % |  | 15 | %
Commodities | 0 | % |  | 10 | %
Fixed income/Cash | 0 | % |  | 10 | %
Actual and estimated future contributions and actual and estimated future benefit payments | Tables 11.12 and 11.13 show the current and estimated future contributions and benefit payments.
| Table | 11.12 |  |  |  |
Company contributions |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
| (in thousands) |  | 12/31/2017 |  | 12/31/2017
| Company Contributions for the Year Ending: |  |  |  |
| 1. Current |  | $ | 9,435 |  |  | $ | — |
| 2. Current + 1 |  | 10,950 |  |  | — |
| Table | 11.13 |  |  |  |
Benefit payments - total |  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
| (in thousands) |  | 12/31/2017 |  | 12/31/2017
| Actual Benefit Payments for the Year Ending: |  |  |  |
| 1. Current |  | $ | 17,913 |  |  | $ | 1,086 |
| Expected Benefit Payments for the Year Ending: |  |  |  |  |  |
| 2. Current + 1 |  | 28,639 |  |  | 1,174 |
| 3. Current + 2 |  | 33,127 |  |  | 1,368 |
| 4. Current + 3 |  | 29,669 |  |  | 1,689 |
| 5. Current + 4 |  | 31,085 |  |  | 1,944 |
| 6. Current + 5 |  | 31,899 |  |  | 2,044 |
| 7. Current + 6 - 10 |  | 151,512 |  |  | 11,914 |
Effect of a 1% change in the health care trend rate assumption | A 1 percentage point change in the health care trend rate assumption would have the following effects on other postretirement benefits:
| Table | 11.14 |  |  |  |
Health care trend rate assumption | (in thousands) |  | 1-Percentage Point Increase |  | 1-Percentage Point Decrease
| Effect on total service and interest cost components |  | $ | 252 |  |  | $ | (217 | )
| Effect on postretirement benefit obligation |  | 3,093 |  |  | (2,748 | )
Pension Plan |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Fair value of plan assets | Tables 11.10a and 11.10b set forth by level, within the fair value hierarchy, the pension plan assets and related accrued investment income at fair value as of December 31, 2017 and 2016. There were no securities that utilized Level 3 inputs.
| Table | 11.10a |  |  |  |  |  |
Pension plan - current year | Assets at fair value as of December 31, 2017
(in thousands) |  | Level 1 |  | Level 2 |  | Total
| Domestic Mutual Funds |  | $ | 1,006 |  |  | $ | — |  |  | $ | 1,006 |
| Corporate Bonds |  | — |  |  | 202,840 |  |  | 202,840 |
| U.S. Government Securities |  | 17,996 |  |  | 1,400 |  |  | 19,396 |
| Municipal Bonds |  | — |  |  | 62,293 |  |  | 62,293 |
| Foreign Bonds |  | — |  |  | 32,949 |  |  | 32,949 |
| ETFs |  | 5,734 |  |  | — |  |  | 5,734 |
| Pooled Equity Accounts |  | — |  |  | 76,924 |  |  | 76,924 |
| Total Assets at fair value |  | $ | 24,736 |  |  | $ | 376,406 |  |  | $ | 401,142 |
| Table | 11.10b |  |  |  |  |  |
Pension plan - prior year | Assets at fair value as of December 31, 2016
(in thousands) |  | Level 1 |  | Level 2 |  | Total
| Domestic Mutual Funds |  | $ | 11,805 |  |  | $ | — |  |  | $ | 11,805 |
| Corporate Bonds |  | — |  |  | 178,412 |  |  | 178,412 |
| U.S. Government Securities |  | 6,761 |  |  | 354 |  |  | 7,115 |
| Municipal Bonds |  | — |  |  | 63,492 |  |  | 63,492 |
| Foreign Bonds |  | — |  |  | 27,917 |  |  | 27,917 |
| ETFs |  | 5,694 |  |  | — |  |  | 5,694 |
| Pooled Equity Accounts |  | — |  |  | 66,465 |  |  | 66,465 |
| Total Assets at fair value |  | $ | 24,260 |  |  | $ | 336,640 |  |  | $ | 360,900 |
Other Postretirement Benefit Plan |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Fair value of plan assets | Tables 11.11a and 11.11b set forth the other postretirement benefits plan assets at fair value as of December 31, 2017 and 2016. All are Level 1 assets.
| Table | 11.11a |  |  |  |
Other postretirement benefits plan - current year | Assets at fair value as of December 31, 2017
(in thousands) |  | Level 1 |  | Total
Domestic Mutual Funds |  | $ | 64,489 |  |  | $ | 64,489 |
| International Mutual Funds |  | 20,814 |  |  | 20,814 |
| Total Assets at fair value |  | $ | 85,303 |  |  | $ | 85,303 |
| Table | 11.11b |  |  |  |
Other postretirement benefits plan - prior year | Assets at fair value as of December 31, 2016
(in thousands) |  | Level 1 |  | Total
Domestic Mutual Funds |  | $ | 54,426 |  |  | $ | 54,426 |
| International Mutual Funds |  | 15,982 |  |  | 15,982 |
| Total Assets at fair value |  | $ | 70,408 |  |  | $ | 70,408 |

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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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. + 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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