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Revenue from Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenues
The following tables provide further disaggregation of our revenues, by categories we use to evaluate our financial performance within each of our reportable segments, for the three months ended March 31, 2022 and 2021 (in thousands):
For the three months ended March 31,
2022% of
Total		2021% of
Total
United States electrical construction and facilities services:
Commercial market sector$270,315 52 %$245,841 53 %
Manufacturing market sector66,465 13 %48,454 11 %
Healthcare market sector32,070 6 %20,151 4 %
Institutional market sector31,766 6 %43,639 9 %
Transportation market sector45,082 8 %42,031 9 %
Water and wastewater market sector5,312 1 %3,651 1 %
Hospitality market sector2,623 1 %4,664 1 %
Short duration projects (1)
56,048 11 %44,409 10 %
Service work13,329 2 %7,765 2 %
523,010 460,605 
Less intersegment revenues(980)(1,210)
Total segment revenues$522,030 $459,395 
 ________
(1)Represents those projects which generally are completed within three months or less.
NOTE 3 - Revenue from Contracts with Customers (Continued)
For the three months ended March 31,
2022% of
Total		2021% of
Total
United States mechanical construction and facilities services:
Commercial market sector$379,604 38 %$366,477 40 %
Manufacturing market sector149,571 15 %121,686 13 %
Healthcare market sector120,051 12 %112,656 12 %
Institutional market sector70,627 7 %69,304 8 %
Transportation market sector16,053 2 %18,417 2 %
Water and wastewater market sector61,744 6 %43,848 5 %
Hospitality market sector8,079 1 %8,529 1 %
Short duration projects (1)
62,294 6 %86,765 9 %
Service work134,715 13 %88,490 10 %
1,002,738 916,172 
Less intersegment revenues(2,268)(1,671)
Total segment revenues$1,000,470 $914,501 
 ________
(1)Represents those projects which generally are completed within three months or less.
For the three months ended March 31,
2022% of
Total		2021% of
Total
United States building services:
Mobile mechanical services$373,571 60 %$351,317 62 %
Commercial site-based services203,550 32 %175,647 31 %
Government site-based services50,680 8 %41,072 7 %
Total segment revenues$627,801 $568,036 
For the three months ended March 31,
2022% of
Total		2021% of
Total
United States industrial services:
Field services$271,418 87 %$207,554 88 %
Shop services39,333 13 %27,828 12 %
Total segment revenues$310,751 $235,382 
Total United States operations$2,461,052 $2,177,314 
For the three months ended March 31,
2022% of
Total		2021% of
Total
United Kingdom building services:
Service work$64,817 49 %$61,991 49 %
Project work66,680 51 %64,744 51 %
Total segment revenues$131,497 $126,735 
Total operations$2,592,549 $2,304,049 
Accounts Receivable, Allowance for Credit Losses
The change in the allowance for credit losses for the three months ended March 31, 2022 was as follows (in thousands):
Balance at December 31, 2021$23,534 
Provision for credit losses15 
Amounts written off against the allowance, net of recoveries(593)
Balance at March 31, 2022$22,956 
Contract Assets and Contract Liabilities
Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following as of March 31, 2022 and December 31, 2021 (in thousands):
March 31,
2022		December 31, 2021
Contract assets, current$262,119 $230,143 
Contract assets, non-current— — 
Contract liabilities, current(827,708)(788,134)
Contract liabilities, non-current(1,663)(2,505)
Net contract liabilities$(567,252)$(560,496)
Remaining Performance Obligations
The following table presents the transaction price allocated to remaining unsatisfied performance obligations (“remaining performance obligations”) for each of our reportable segments and their respective percentages of total remaining performance obligations as of March 31, 2022 (in thousands, except for percentages):
March 31,
2022		% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,297,086 22 %
United States mechanical construction and facilities services3,384,089 57 %
United States building services995,003 16 %
United States industrial services116,496 2 %
Total United States operations5,792,674 97 %
United Kingdom building services160,207 3 %
Total operations$5,952,881 100 %
Remaining Performance Obligations, Expected Timing of Satisfaction
Refer to the table below for additional information regarding our remaining performance obligations, including an estimate of when we expect to recognize such remaining performance obligations as revenue (in thousands):
Within one yearGreater than one year
Remaining performance obligations:
United States electrical construction and facilities services$1,150,600 $146,486 
United States mechanical construction and facilities services2,737,236 646,853 
United States building services892,868 102,135 
United States industrial services116,496 — 
Total United States operations4,897,200 895,474 
United Kingdom building services135,870 24,337 
Total operations$5,033,070 $919,811