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Accounts receivable and allowance for doubtful accounts Receivables and allowance for expected credit losses (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance $ 12,714 $ 15,358 $ 11,125 $ 8,497
Current expected credit loss provision (841) (317) 1,075 3,555
Less write-offs charged against the allowance 1,424 2,669 1,399 1,265
Credit loss recoveries collected 299 342 289 338
Balance 10,748 12,714 11,090 11,125
Electric        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance 678 899 492 328
Current expected credit loss provision (110) 538 303 555
Less write-offs charged against the allowance 341 888 224 500
Credit loss recoveries collected 100 129 88 109
Balance 327 678 659 492
Natural gas distribution        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance 2,950 2,571 1,817 1,056
Current expected credit loss provision (103) 1,273 190 1,156
Less write-offs charged against the allowance 787 1,107 677 624
Credit loss recoveries collected 199 213 201 229
Balance 2,259 2,950 1,531 1,817
Pipeline        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance 2 2 0 0
Current expected credit loss provision 0 0 0 0
Less write-offs charged against the allowance 0 0 0 0
Credit loss recoveries collected 0 0 0 0
Balance 2 2 0 0
Construction materials and contracting        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance 4,842 6,164 5,983 5,357
Current expected credit loss provision 11 (1,049) (314) 694
Less write-offs charged against the allowance 232 273 44 68
Credit loss recoveries collected 0 0 0 0
Balance 4,621 4,842 5,625 5,983
Construction services        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance 4,242 5,722 2,833 1,756
Current expected credit loss provision (639) (1,079) 896 1,150
Less write-offs charged against the allowance 64 401 454 73
Credit loss recoveries collected 0 0 0 0
Balance $ 3,539 $ 4,242 $ 3,275 $ 2,833