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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The following tables set forth the change in plan assets, change in projected benefit obligation, rate assumptions and components of net periodic benefit cost as of December 31 with respect to these plans. The measurement dates of the assets and liabilities of both plans were December 31 of the respective years presented.
| Year Ended December 31, 2017
(in thousands) | Hourly Employees’ Pension Plan | Employees’ Retirement Plan |  | Total
Change in projected benefit obligation |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | — |  |  |  | $ | 20,787 |  |  |  | $ | 20,787 |
Service cost |  | — |  |  |  | 4 |  |  |  | 4 |
Interest cost |  | — |  |  |  | 831 |  |  |  | 831 |
Liability actuarial (gain) loss |  | — |  |  |  | 866 |  |  |  | 866 |
Benefits paid |  | — |  |  |  | (936 | ) |  |  | (936 | )
Benefit obligation at end of year |  | — |  |  |  | 21,552 |  |  |  | 21,552 |
Change in fair value of plan assets |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | — |  |  |  | 17,858 |  |  |  | 17,858 |
Return on plan assets |  | — |  |  |  | 2,505 |  |  |  | 2,505 |
Employer contributions |  | — |  |  |  | 900 |  |  |  | 900 |
Benefits paid |  | — |  |  |  | (936 | ) |  |  | (936 | )
Fair value of plan assets at end of year |  | — |  |  |  | 20,327 |  |  |  | 20,327 |
Underfunded status - December 31, 2017 |  | $ | — |  |  |  | $ | (1,225 | ) |  |  | $ | (1,225 | )
| Year Ended December 31, 2016
(in thousands) | Hourly Employees’ Pension Plan | Employees’ Retirement Plan |  | Total
Change in projected benefit obligation |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 9,649 |  |  |  | $ | 20,561 |  |  |  | $ | 30,210 |
Service cost |  | 8 |  |  |  | 4 |  |  |  | 12 |
Interest cost |  | 401 |  |  |  | 886 |  |  |  | 1,287 |
Liability actuarial (gain) |  | (148 | ) |  |  | 204 |  |  |  | 56 |
Benefits paid |  | (575 | ) |  |  | (868 | ) |  |  | (1,443 | )
Settlements |  | (9,335 | ) |  |  | — |  |  |  | (9,335 | )
Benefit obligation at end of year |  | — |  |  |  | 20,787 |  |  |  | 20,787 |
Change in fair value of plan assets |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | 9,019 |  |  |  | 16,692 |  |  |  | 25,711 |
Return on plan assets |  | 119 |  |  |  | 1,284 |  |  |  | 1,403 |
Employer contributions |  | 772 |  |  |  | 750 |  |  |  | 1,522 |
Benefits paid |  | (575 | ) |  |  | (868 | ) |  |  | (1,443 | )
Settlements |  | (9,335 | ) |  |  | — |  |  |  | (9,335 | )
Fair value of plan assets at end of year |  | — |  |  |  | 17,858 |  |  |  | 17,858 |
Underfunded status - December 31, 2016 |  | $ | — |  |  |  | $ | (2,929 | ) |  |  | $ | (2,929 | )
Schedule of Assumptions Used | Assumptions used to determine benefit obligations at December 31:
|  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan
|  | 2017 | 2016 |  | 2017 | 2016
Discount rate |  | N/A | N/A |  | 3.60% | 4.10%
Composite rate of compensation increase |  | N/A | N/A |  | N/A | N/A
Assumptions used to determine net periodic benefit cost for the years ended December 31:
|  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan
|  | 2017 | 2016 |  | 2017 | 2016
Discount rate |  | N/A | 4.30% |  | 4.10% | 4.40%
Long-term rate of return on plan assets |  | N/A | 7.25% |  | 7.25% | 7.25%
Composite rate of compensation increase |  | N/A | N/A |  | N/A | N/A
Schedule of Net Benefit Costs | The following tables present the components of net periodic benefit cost (gains are denoted with parentheses and losses are not):
| Year Ended December 31, 2017
(in thousands) | Hourly Employees’ Pension Plan | Employees’ Retirement Plan |  | Total
Service cost |  | $ | — |  |  |  | $ | 4 |  |  |  | $ | 4 |
Interest cost |  | — |  |  |  | 831 |  |  |  | 831 |
Expected return on plan assets |  | — |  |  |  | (1,275 | ) |  |  | (1,275 | )
Amortization of net loss |  | — |  |  |  | 433 |  |  |  | 433 |
Net periodic benefit cost |  | $ | — |  |  |  | $ | (7 | ) |  |  | $ | (7 | )
| Year Ended December 31, 2016
(in thousands) | Hourly Employees’ Pension Plan | Employees’ Retirement Plan |  | Total
Service cost |  | $ | 8 |  |  |  | $ | 4 |  |  |  | $ | 12 |
Interest cost |  | 401 |  |  |  | 886 |  |  |  | 1,287 |
Expected return on plan assets |  | (648 | ) |  |  | (1,196 | ) |  |  | (1,844 | )
Amortization of net loss |  | 284 |  |  |  | 440 |  |  |  | 724 |
Recognition of Settlement |  | 2,889 |  |  |  | — |  |  |  | 2,889 |
Net periodic benefit cost |  | $ | 2,934 |  |  |  | $ | 134 |  |  |  | $ | 3,068 |
Schedule of Allocation of Plan Assets | The pension plans' weighted-average asset allocations as a percentage of plan assets at December 31 are as follows:
|  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan
|  | 2017 | 2016 |  | 2017 | 2016
Equity securities |  | —% | —% |  | 55% | 54%
Debt securities |  | —% | —% |  | 38% | 38%
Short-term investments |  | —% | —% |  | 2% | 3%
Other |  | —% | —% |  | 5% | 5%
Total |  | —% | —% |  | 100% | 100%
Fair Value, Assets Measured on Recurring Basis | The following table presents the hierarchy levels for our postretirement benefit plan investments as of December 31 as described in Note 1 to the Consolidated Financial Statements:
(in thousands) | December 31, 2017 | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3)
Mutual Funds: |  |  |  |  |  |  |  |  |  |  |
| Mid Cap |  | $ | 1,321 |  |  |  | $ | 1,321 |  |  |  | $ | — |  |  |  | $ | — |
| Large Cap |  | 2,930 |  |  |  | 2,930 |  |  |  | — |  |  |  | — |
| International |  | 2,300 |  |  |  | 2,300 |  |  |  | — |  |  |  | — |
Common/Collective Trusts: |  |  |  |  |  |  |  |  |  |  |
| Liability Driven Solution |  | 2,845 |  |  |  | — |  |  |  | 2,845 |  |  |  | — |
| Wells Fargo BlackRock International Equity |  | 859 |  |  |  | — |  |  |  | 859 |  |  |  | — |
| Wells Fargo Core Bond |  | 1,416 |  |  |  | — |  |  |  | 1,416 |  |  |  | — |
| Wells Fargo/Causeway |  | 861 |  |  |  | — |  |  |  | 861 |  |  |  | — |
| Wells Fargo BlackRock Large Cap Growth Index Fund |  | 1,146 |  |  |  | — |  |  |  | 1,146 |  |  |  | — |
| Wells Fargo BlackRock Large Cap Value Index Fund |  | 1,146 |  |  |  | — |  |  |  | 1,146 |  |  |  | — |
| Wells Fargo Multi-Manager Small Cap |  | 1,387 |  |  |  | — |  |  |  | 1,387 |  |  |  | — |
| Wells Fargo Russell 2000 Index Fund |  | 636 |  |  |  | — |  |  |  | 636 |  |  |  | — |
| Wells Fargo S&P Mid Cap Index Fund |  | 715 |  |  |  | — |  |  |  | 715 |  |  |  | — |
| Wells Fargo/MFS Value CIT F |  | 578 |  |  |  | — |  |  |  | 578 |  |  |  | — |
| Wells Fargo/T. Rowe Price I Large-Cap Growth Managed CIT |  | 577 |  |  |  | — |  |  |  | 577 |  |  |  | — |
| Wells Fargo/T. Rowe Price Equity Income |  | 577 |  |  |  | — |  |  |  | 577 |  |  |  | — |
| Wells Fargo Voya Large Cap Growth CIT F |  | 577 |  |  |  | — |  |  |  | 577 |  |  |  | — |
Cash & Short-term Investments |  | 456 |  |  |  | 456 |  |  |  | — |  |  |  | — |
| Total |  | $ | 20,327 |  |  |  | $ | 7,007 |  |  |  | $ | 13,320 |  |  |  | $ | — |
(in thousands) | December 31, 2016 | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3)
Mutual Funds: |  |  |  |  |  |  |  |  |  |  |
| Mid Cap |  | $ | 680 |  |  |  | $ | 680 |  |  |  | $ | — |  |  |  | $ | — |
| Large Cap |  | 3,553 |  |  |  | 3,553 |  |  |  | — |  |  |  | — |
| International |  | 2,010 |  |  |  | 2,010 |  |  |  | — |  |  |  | — |
Common/Collective Trusts: |  |  |  |  |  |  |  |  |  |  |
| Liability Driven Solution |  | 2,522 |  |  |  | — |  |  |  | 2,522 |  |  |  | — |
| Wells Fargo BlackRock International Equity |  | 727 |  |  |  | — |  |  |  | 727 |  |  |  | — |
| Wells Fargo Core Bond |  | 1,254 |  |  |  | — |  |  |  | 1,254 |  |  |  | — |
| Wells Fargo/Causeway |  | 741 |  |  |  | — |  |  |  | 741 |  |  |  | — |
| Wells Fargo BlackRock Large Cap Growth Index Fund |  | 1,009 |  |  |  | — |  |  |  | 1,009 |  |  |  | — |
| Wells Fargo BlackRock Large Cap Value Index Fund |  | 1,006 |  |  |  | — |  |  |  | 1,006 |  |  |  | — |
| Wells Fargo Multi-Manager Small Cap |  | 1,189 |  |  |  | — |  |  |  | 1,189 |  |  |  | — |
| Wells Fargo Russell 2000 Index Fund |  | 560 |  |  |  | — |  |  |  | 560 |  |  |  | — |
| Wells Fargo S&P Mid Cap Index Fund |  | 630 |  |  |  | — |  |  |  | 630 |  |  |  | — |
| Wells Fargo/MFS Value CIT F |  | 501 |  |  |  | — |  |  |  | 501 |  |  |  | — |
| Wells Fargo/T. Rowe Price I Large-Cap Growth Managed CIT |  | 505 |  |  |  | — |  |  |  | 505 |  |  |  | — |
| T. Rowe Price Equity Income |  | 504 |  |  |  | — |  |  |  | 504 |  |  |  | — |
Cash & Short-term Investments |  | 467 |  |  |  | 467 |  |  |  | — |  |  |  | — |
| Total |  | $ | 17,858 |  |  |  | $ | 6,710 |  |  |  | $ | 11,148 |  |  |  | $ | — |
Schedule of Expected Benefit Payments | The following table illustrates the estimated pension benefit payments that are projected to be paid:
(in thousands) | Employees’ Retirement Plan
2018 |  | $ | 1,125 |  |
2019 |  | 1,146 |  |
2020 |  | 1,160 |  |
2021 |  | 1,220 |  |
2022 |  | 1,253 |  |
Years 2023 through 2027 |  | 6,348 |  |
Supplemental Employee Retirement Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Assumptions Used | Assumptions used to determine benefit obligations at December 31:
|  | 2017 | 2016
Discount rate |  | 3.45% | 3.85%
Composite rate of compensation increase |  | 3.00% | 3.00%
Assumptions used to determine net periodic benefit cost for the years ended December 31:
|  | 2017 | 2016
Discount rate |  | 3.85% | 4.05%
Composite rate of compensation increase |  | 3.00% | 3.00%
Long-term rate of return on plan assets |  | N/A | N/A
Schedule of Net Benefit Costs | The components of net periodic pension expense were as follows:
|  | Year Ended December 31,
(in thousands) |  | 2017 |  | 2016
Service cost |  | $ | 198 |  |  | $ | 176 |
Interest cost |  | 204 |  |  | 175 |
Amortization of prior service cost |  | 406 |  |  | 364 |
Net periodic benefit cost |  | $ | 808 |  |  | $ | 715 |
Schedule of Expected Benefit Payments | Future estimated benefits expected to be paid from the plan over the next ten years as follows in thousands:
2018 | $ | 291 |
2019 | 294 |
2020 | 315 |
2021 | 317 |
2022 | 366 |
Years 2023 through 2027 | 2,355 |
Schedule of Defined Benefit Plans Disclosures | The change in the Projected Benefit Obligation (PBO) as of December 31, 2017 and 2016, is shown below:
|  | Year Ended December 31, |
(in thousands) |  | 2017 |  | 2016
Benefit obligation at January 1, |  | $ | 5,387 |  |  | $ | 3,962 |
Service cost |  | 198 |  |  | 176 |
Interest cost |  | 204 |  |  | 175 |
Liability actuarial loss (gain) |  | 247 |  |  | 183 |
Benefits paid |  | (91 | ) |  | (67 | )
Plan amendments |  | — |  |  | 958 |
Benefit obligation at December 31, |  | $ | 5,945 |  |  | $ | 5,387 |

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