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REVENUE - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Deferred revenue from contracts with customers:        
Beginning balance $ 149,731 $ 178,030 $ 145,493 $ 162,068
Revenue recognized, included in beginning balance (52,406) (79,261) (84,375) (86,419)
Additions, net of revenue recognized during period, and other 56,799 73,352 93,006 96,472
Ending balance $ 154,124 $ 172,121 $ 154,124 $ 172,121