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Multiemployer Plans | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | Multiemployer plans The Company contributes to a number of MEPPs under the terms of collective-bargaining agreements that cover its union-represented employees. The risks of participating in these multiemployer plans are different from single-employer plans in the following aspects:
• | Assets contributed to the MEPP by one employer may be used to provide benefits to employees of other participating employers
• | If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers
• | If the Company chooses to stop participating in some of its MEPPs, the Company may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability
The Company's participation in these plans is outlined in the following table. Unless otherwise noted, the most recent Pension Protection Act zone status available in 2019 and 2018 is for the plan's year-end at December 31, 2018, and December 31, 2017, respectively. The zone status is based on information that the Company received from the plan and is certified by the plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are between 65 percent and 80 percent funded, and plans in the green zone are at least 80 percent funded.
| EIN/Pension Plan Number | Pension Protection Act Zone Status | FIP/RP Status Pending/Implemented | Contributions | Surcharge Imposed | Expiration Date of Collective Bargaining Agreement |
Pension Fund | 2019 | 2018 | 2019 |  | 2018 |  | 2017 |  |
|  |  |  |  | (In thousands) |  |  |
Alaska Laborers-Employers Retirement Fund | 91-6028298-001 | Yellow as of 6/30/2019 | Yellow as of 6/30/2018 | Implemented | $ | 815 |  | $ | 732 |  | $ | 690 |  | No | 12/31/2020 |
Construction Industry and Laborers Joint Pension Trust for So Nevada, Plan A | 88-0135695-001 | Red | Red | Implemented | 544 |  | 346 |  | 377 |  | No | 6/30/2020 |
Edison Pension Plan | 93-6061681-001 | Green | Green | No | 12,252 |  | 12,111 |  | 12,725 |  | No | 12/31/2020 |
IBEW Local 212 Pension Trust | 31-6127280-001 | Green as of 4/30/2019 | Green as of 4/30/2018 | No | 1,110 |  | 1,341 |  | 1,312 |  | No | 6/1/2025 |
IBEW Local 357 Pension Plan A | 88-6023284-001 | Green | Green | No | 10,162 |  | 3,460 |  | 3,286 |  | No | 5/31/2021 |
IBEW Local 648 Pension Plan | 31-6134845-001 | Yellow as of 2/28/2019 | Yellow as of 2/28/2018 | Implemented | 728 |  | 2,175 |  | 2,254 |  | No | 8/29/2021 |
IBEW Local 82 Pension Plan | 31-6127268-001 | Green as of 6/30/2019 | Green as of 6/30/2018 | No | 1,662 |  | 1,569 |  | 1,757 |  | No | 12/3/2023 |
Idaho Plumbers and Pipefitters Pension Plan | 82-6010346-001 | Green as of 5/31/2019 | Green as of 5/31/2018 | No | 1,307 |  | 1,247 |  | 1,156 |  | No | 3/31/2023 |
Minnesota Teamsters Construction Division Pension Fund | 41-6187751-001 | Green as of 11/30/2018 | Green as of 11/30/2017 | No | 673 |  | 740 |  | 826 |  | No | 4/30/2021 |
National Automatic Sprinkler Industry Pension Fund | 52-6054620-001 | Red | Red | Implemented | 1,074 |  | 738 |  | 718 |  | No | 3/31/2021- 7/31/2024 |
National Electrical Benefit Fund | 53-0181657-001 | Green | Green | No | 12,679 |  | 8,468 |  | 8,891 |  | No | 8/31/2019- 6/1/2025 | *
Pension Trust Fund for Operating Engineers | 94-6090764-001 | Yellow | Yellow | Implemented | 2,598 |  | 2,403 |  | 2,391 |  | No | 3/31/2020- 6/15/2022 |
Sheet Metal Workers Pension Plan of Southern CA, AZ, and NV | 95-6052257-001 | Yellow | Yellow | Implemented | 2,119 |  | 1,774 |  | 1,016 |  | No | 6/30/2020 |
Southwest Marine Pension Trust | 95-6123404-001 | Red | Red | Implemented | 132 |  | 81 |  | 48 |  | No | 1/31/2024 |
Other funds |  |  |  |  | 24,670 |  | 21,537 |  | 19,298 |  |  |  |
Total contributions | $ | 72,525 |  | $ | 58,722 |  | $ | 56,745 |  |  |  |
* | Plan includes contributions required by collective bargaining agreements which have expired, but contain provisions automatically renewing their terms in the absence of a subsequent negotiated agreement.
The Company was listed in the plans' Forms 5500 as providing more than 5 percent of the total contributions for the following plans and plan years:
Pension Fund | Year Contributions to Plan Exceeded More Than 5 Percent of Total Contributions (as of December 31 of the Plan's Year-End)
Edison Pension Plan | 2018 and 2017
IBEW Local 82 Pension Plan | 2018 and 2017
IBEW Local 124 Pension Trust Fund | 2018 and 2017
IBEW Local 212 Pension Trust Fund | 2018 and 2017
IBEW Local 357 Pension Plan A | 2018 and 2017
IBEW Local 648 Pension Plan | 2018 and 2017
IBEW Local Union No 226 Open End Pension Fund | 2018
Idaho Plumbers and Pipefitters Pension Plan | 2018 and 2017
International Union of Operating Engineers Local 701 Pension Trust Fund | 2018 and 2017
Minnesota Teamsters Construction Division Pension Fund | 2018 and 2017
Pension and Retirement Plan of Plumbers and Pipefitters Local 525 | 2018 and 2017
The Company also contributes to a number of multiemployer other postretirement plans under the terms of collective-bargaining agreements that cover its union-represented employees. These plans provide benefits such as health insurance, disability insurance and life insurance to retired union employees. Many of the multiemployer other postretirement plans are combined with active multiemployer health and welfare plans. The Company's total contributions to its multiemployer other postretirement plans, which also includes contributions to active multiemployer health and welfare plans, were $59.5 million, $51.9 million and $50.8 million for the years ended December 31, 2019, 2018 and 2017, respectively. Amounts contributed in 2019, 2018 and 2017 to defined contribution multiemployer plans were $49.2 million, $31.1 million and $32.2 million, respectively.

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