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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Changes in Benefit Obligations and Assets
The change in benefit obligations and assets of the UK Plan for the years ended December 31, 2020 and 2019 consisted of the following components (in thousands):
 20202019
Change in pension benefit obligation  
Benefit obligation at beginning of year$322,766 $281,776 
Interest cost6,401 7,961 
Actuarial loss50,863 32,866 
Benefits paid(10,029)(12,059)
Foreign currency exchange rate changes13,141 12,222 
Benefit obligation at end of year383,142 322,766 
Change in pension plan assets  
Fair value of plan assets at beginning of year307,001 264,194 
Actual return on plan assets34,380 38,808 
Employer contributions4,665 4,428 
Benefits paid(10,029)(12,059)
Foreign currency exchange rate changes11,394 11,630 
Fair value of plan assets at end of year347,411 307,001 
Funded status at end of year$(35,731)$(15,765)
Schedule of Net Periodic Benefit Cost Not yet Recognized
Amounts not yet reflected in net periodic pension cost and included in accumulated other comprehensive loss were as follows (in thousands):
 20202019
Unrecognized losses$125,020 $94,211 
Schedule of Weighted Average Assumptions Used To Calculate Benefit Obligation
The weighted average assumptions used to determine benefit obligations as of December 31, 2020 and 2019 were as follows:
 20202019
Discount rate1.4 %2.1 %
Schedule of Weighted Average Assumptions Used To Calculate Net Periodic Pension Cost
The weighted average assumptions used to determine net periodic pension cost for the years ended December 31, 2020, 2019, and 2018 were as follows:
 202020192018
Discount rate2.1 %2.9 %2.5 %
Annual rate of return on plan assets4.3 %4.9 %5.0 %
Components Of Net Periodic Pension Cost
The components of net periodic pension cost (income) of the UK Plan for the years ended December 31, 2020, 2019, and 2018 were as follows (in thousands):
 202020192018
Interest cost$6,401 $7,961 $8,085 
Expected return on plan assets(12,023)(12,165)(13,797)
Amortization of unrecognized loss2,389 2,342 2,630 
Net periodic pension cost (income)$(3,233)$(1,862)$(3,082)
Schedule of Weighted Average Asset Allocations and Weighted Average Target Allocations The weighted average asset allocations and weighted average target allocations at December 31, 2020 and 2019 were as follows:
 
Asset CategoryTarget
Asset
Allocation 		December 31,
2020		December 31,
2019
Debt65.0 %63.0 %70.6 %
Equity15.0 %12.7 %10.5 %
Cash10.0 %17.1 %10.5 %
Real estate10.0 %7.2 %8.4 %
Total100.0 %100.0 %100.0 %
Schedule of Plan Assets Fair Value Hierarchy
The following tables set forth the fair value of assets of the UK Plan as of December 31, 2020 and 2019 (in thousands):
 Assets at Fair Value as of December 31, 2020
Asset Category    Level 1Level 2Level 3Total
Corporate debt funds$— $65,486 $— $65,486 
Government bond funds— 57,133 — 57,133 
Equity funds— 44,132 — 44,132 
Cash59,246 — — 59,246 
Total plan assets in fair value hierarchy$59,246 $166,751 $— 225,997 
Plan assets measured using NAV as a practical expedient: (1)
Debt funds96,196 
Real estate funds25,218 
Total plan assets at fair value$347,411 

 Assets at Fair Value as of December 31, 2019
Asset Category    Level 1Level 2Level 3Total
Corporate debt funds$— $64,314 $— $64,314 
Government bond funds— 49,164 — 49,164 
Equity funds— 32,356 — 32,356 
Cash32,240 — — 32,240 
Total plan assets in fair value hierarchy$32,240 $145,834 $— 178,074 
Plan assets measured using NAV as a practical expedient: (1)
Debt funds103,188 
Real estate funds25,739 
Total plan assets at fair value$307,001 
_________________
(1)Certain investments measured using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets.
Schedule of Expected Benefit Payments
The following estimated benefit payments are expected to be paid in the following years (in thousands):
 Pension
Benefit Payments
2021$11,036 
2022$11,356 
2023$11,684 
2024$12,021 
2025$12,370 
Succeeding five years$67,423 
Schedule of Accumulated Benefit Obligations in Excess of Plan Assets
The following table shows certain information for the UK Plan where the accumulated benefit obligation is in excess of plan assets as of December 31, 2020 and 2019 (in thousands):
 20202019
Projected benefit obligation$383,142 $322,766 
Accumulated benefit obligation$383,142 $322,766 
Fair value of plan assets$347,411 $307,001 
Schedule of Multiemployer Plans
The following table lists all domestic MEPPs to which our contributions exceeded $2.0 million in 2020. Additionally, this table also lists all domestic MEPPs to which we contributed in 2020 in excess of $0.5 million for MEPPs in the critical status, “red zone,” and $1.0 million for MEPPs in the endangered status, “orange or yellow zones,” as defined by the PPA (in thousands):
Pension FundEIN/Pension Plan Number
PPA Zone Status (1)
FIP/RP
Status
Contributions 
Contributions greater than 5% of total plan contributions (2)
Expiration
date or range of expiration dates of CBA(s)
20202019202020192018
National Automatic Sprinkler Industry Pension Fund52-6054620001RedRedImplemented$17,504 $15,924 $14,888 NoMarch 2021 to
June 2023
Plumbers & Pipefitters National Pension Fund52-6152779001YellowYellowImplemented14,095 13,821 11,868 NoFebruary 2021 to
August 2026
Sheet Metal Workers National Pension Fund52-6112463001YellowYellowImplemented11,621 11,713 10,895 NoApril 2021 to
June 2024
National Electrical Benefit Fund53-0181657001GreenGreenNA11,573 16,901 10,700 NoFebruary 2021 to
September 2024
Pension, Hospitalization & Benefit Plan of the Electrical Industry-Pension Trust Account13-6123601001GreenGreenNA11,264 10,075 10,469 NoJanuary 2021 to April 2022
Electrical Workers Local No. 26 Pension Trust Fund52-6117919001GreenGreenNA7,086 8,434 5,485 YesMay 2021 to October 2023
Sheet Metal Workers Pension Plan of Northern California51-6115939001RedRedImplemented6,605 6,233 5,488 NoJune 2021 to June 2026
Central Pension Fund of the IUOE & Participating Employers36-6052390001GreenGreenNA6,115 6,253 6,384 NoFebruary 2021 to
December 2023
Southern California IBEW-NECA Pension Trust Fund95-6392774001YellowYellowImplemented5,719 6,277 5,754 NoMay 2021 to
November 2023
Plumbers Pipefitters & Mechanical Equipment Service Local Union 392 Pension Plan31-0655223001RedRedImplemented5,667 6,412 6,047 YesJune 2022
San Diego Electrical Pension Plan95-6101801001GreenGreenNA4,383 3,843 3,008 YesMay 2021 to May 2022
 
NOTE 15 - RETIREMENT PLANS - (Continued)
Pension FundEIN/Pension Plan Number
PPA Zone Status (1)
FIP/RP
Status		Contributions
Contributions greater than 5% of total plan contributions (2)
Expiration
date or range of expiration dates of CBA(s)
20202019202020192018
Pipefitters Union Local 537 Pension Fund51-6030859001GreenGreenNA4,275 4,754 6,038 YesFebruary 2021 to September 2021
Arizona Pipe Trades Pension Trust Fund86-6025734001GreenGreenNA4,142 6,071 2,640 YesJune 2021
Southern California Pipe Trades Retirement Fund51-6108443001GreenGreenNA4,043 3,274 3,095 NoJune 2021 to June 2026
Edison Pension Plan93-6061681001GreenGreenNA3,864 5,361 3,140 YesDecember 2021
Heating, Piping & Refrigeration Pension Fund52-1058013001GreenGreenNA3,349 4,185 2,619 NoJuly 2022
Eighth District Electrical Pension Fund84-6100393001GreenGreenNA3,242 3,590 3,486 YesFebruary 2021 to May 2023
U.A. Local 393 Pension Trust Fund Defined Benefit94-6359772002GreenGreenNA3,168 3,858 4,298 YesJune 2021 to July 2021
Electrical Contractors Association of the City of Chicago Local Union 134, IBEW Joint Pension Trust of Chicago Pension Plan 251-6030753002GreenGreenNA3,004 3,204 4,308 NoJune 2021
U.A. Local 38 Defined Benefit Pension Plan94-1285319001GreenGreenNA2,874 2,030 1,551 NoJune 2021 to June 2023
Sheet Metal Workers Pension Plan of Southern California, Arizona & Nevada95-6052257001YellowYellowImplemented2,706 2,423 1,934 NoJune 2021 to June 2026
Northern California Pipe Trades Pension Plan94-3190386001GreenGreenNA2,463 3,077 3,104 NoJune 2021
U.A. Plumbers Local 24 Pension Fund22-6042823001GreenGreenNA2,460 2,460 3,461 YesApril 2021
NECA-IBEW Pension Trust Fund51-6029903001GreenGreenNA2,369 2,528 2,650 YesMay 2021 to December 2021
Northern California Electrical Workers Pension Plan94-6062674001GreenGreenNA2,263 965 1,075 NoMay 2021 to May 2022
Plumbing & Pipe Fitting Local 219 Pension Fund34-6682376001RedRedImplemented1,680 1,937 2,197 YesMay 2023
Boilermaker-Blacksmith National Pension Trust48-6168020001YellowRedImplemented1,574 1,681 1,446 NoSeptember 2021 to
September 2023
Plumbers & Pipefitters Local Union No. 502 & 633 Pension Fund61-6078145001YellowYellowImplemented1,271 1,596 1,167 NoMay 2021 to July 2022
I.B.E.W. Local 701 Pension Fund36-6455509001YellowYellowImplemented1,197 915 588 NoMay 2021 to December 2021
Steamfitters Local Union No. 420 Pension Plan23-2004424001RedRedImplemented553 641 706 NoMay 2023
Other Multiemployer Pension Plans    51,953 55,042 49,740  Various
Total Contributions    $204,082 $215,478 $190,229   
 _________________
(1)    The zone status represents the most recent available information for the respective MEPP, which may be 2019 or earlier for the 2020 year and 2018 or earlier for the 2019 year. In general, plans with a “green” zone status have a funding ratio of at least 80%, plans with an “orange” or “yellow” zone status have a funding ratio of between 65% and less than 80%, and plans with a “red” zone status are less than 65% funded.
(2)    This information was obtained from the respective plan’s Form 5500 (“Forms”) for the most current available filing. These dates may not correspond with our fiscal year contributions. The percentages of contributions are based upon disclosures contained in the plans’ Forms. Those Forms, among other things, disclose the names of individual participating employers whose annual contributions account for more than 5% of the aggregate annual amount contributed by all participating employers for a plan year. Accordingly, if the annual contribution of two or more of our subsidiaries each accounted for less than 5% of such contributions, but in the aggregate accounted for in excess of 5% of such contributions, that greater percentage is not available and accordingly is not disclosed.