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Accounts receivable and allowance for doubtful accounts Receivables and allowance for expected credit losses (Tables)
 6 Months Ended
Jun. 30, 2020
Credit Loss [Abstract]  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
Details of the Company's expected credit losses were as follows:
ElectricNatural gas
distribution		Construction
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