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Supplemental balance sheet and cash flow information (trade accounts receivable, allowance for credit losses) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Trade accounts receivable      
Trade accounts receivable - gross $ 183,466   $ 197,546
Allowance for credit losses (11,206)   (6,541)
Trade accounts receivable - net [1] 172,260   191,005
Unbilled receivables 61,416   $ 43,673
Changes in allowance for credit losses      
Balance, beginning of year 6,541 $ 4,182  
Bad debt expense 12,040 5,191  
Write-offs and other (7,375) (2,774)  
Balance, end of period $ 11,206 $ 6,599  
[1] Includes unbilled receivables of $61,416 as of September 30, 2024 and $43,673 as of December 31, 2023.