Multiemployer Plans (Tables)

12 Months Ended

Dec. 31, 2019

Retirement Benefits [Abstract]

Schedule of Multiemployer Plans [Table Text Block]

	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