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Supplemental balance sheet and cash flow information (trade accounts receivable, allowance for credit losses) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Trade accounts receivable      
Trade accounts receivable - gross $ 184,754   $ 197,546
Allowance for credit losses (9,584)   (6,541)
Trade accounts receivable - net [1] 175,170   191,005
Unbilled receivables 52,249   $ 43,673
Changes in allowance for credit losses      
Balance, beginning of year 6,541 $ 4,182  
Bad debt expense 8,980 3,027  
Write-offs and other (5,937) (1,771)  
Balance, end of period $ 9,584 $ 5,438  
[1] Includes unbilled receivables of $52,249 as of June 30, 2024 and $43,673 as of December 31, 2023.