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Receivables and allowance for expected credit losses
 6 Months Ended
Jun. 30, 2021
Credit Loss [Abstract]  
Receivables and allowance for expected credit loss Receivables and allowance for expected credit losses
Receivables consists primarily of trade receivables from the sale of goods and services, which are recorded at the invoiced amount, and contract assets, net of expected credit losses. For more information on contract assets, see Note 9. The Company's trade receivables are all due in 12 months or less. The total balance of receivables past due 90 days or more was $34.2 million, $45.1 million and $43.9 million at June 30, 2021 and 2020, and December 31, 2020, respectively.
The Company's expected credit losses are determined through a review using historical credit loss experience; changes in asset specific characteristics; current conditions; and reasonable and supportable future forecasts, among other specific account data, and is performed at least quarterly. The Company develops and documents its methodology to determine its allowance for expected credit losses at each of its reportable business segments. Risk characteristics used by the business segments may include customer mix, knowledge of customers, general economic conditions of the various local economies and impacts of COVID-19, among others. Specific account balances are written off when management determines the amounts to be uncollectible. Management has reviewed the balance reserved through the allowance for expected credit losses and believes it is reasonable.
Details of the Company's expected credit losses were as follows:
ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		Total
 (In thousands)
At December 31, 2020$899 $2,571 $2 $6,164 $5,722 $15,358 
Current expected credit loss provision538 1,273 — (1,049)(1,079)(317)
Less write-offs charged against the allowance888 1,107 — 273 401 2,669 
Credit loss recoveries collected129 213 — — — 342 
At March 31, 2021$678 $2,950 $2 $4,842 $4,242 $12,714 
Current expected credit loss provision(110)(103)— 11 (639)(841)
Less write-offs charged against the allowance341 787 — 232 64 1,424 
Credit loss recoveries collected100 199 — — — 299 
At June 30, 2021$327 $2,259 $2 $4,621 $3,539 $10,748 
ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		Total
 (In thousands)
At January 1, 2020$328 $1,056 $— $5,357 $1,756 $8,497 
Current expected credit loss provision555 1,156 — 694 1,150 3,555 
Less write-offs charged against the allowance500 624 — 68 73 1,265 
Credit loss recoveries collected109 229 — — — 338 
At March 31, 2020$492 $1,817 $— $5,983 $2,833 $11,125 
Current expected credit loss provision303 190 — (314)896 1,075 
Less write-offs charged against the allowance224 677 — 44 454 1,399 
Credit loss recoveries collected88 201 — — — 289 
At June 30, 2020$659 $1,531 $— $5,625 $3,275 $11,090