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Description of the business and summary of significant accounting policies: - Allowance for credit losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Description of the business and summary of significant accounting policies:      
Balance at Beginning of Period $ 3,677 $ 2,303 $ 1,510
Current-period Provision for Expected Credit Losses 13,572 10,475 4,318
Write offs Charged Against Allowance (7,487) (9,101) (3,525)
Balance at End of Period $ 9,762 $ 3,677 $ 2,303