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REVENUE RECOGNITION - Allowance and deferred allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance for credit loss      
Beginning balance $ (9,151) $ (8,592) $ (7,515)
Ending balance (9,554) (9,151) (8,592)
Change in allowance 403 559 1,077
Deferred beginning balance 6,537 6,432 5,614
Deferred ending balance 7,133 6,537 6,432
Change in deferred allowance (596) (105) (818)
Net amount charged to revenues (193) 454 259
Revenue recognized for satisfaction $ 237,344 $ 207,560 $ 191,745