UNEARNED REVENUE - Changes in unearned revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
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| UNEARNED REVENUE | ||||
| Beginning balance | $ 149,224 | $ 136,507 | ||
| Deferral of unearned revenue | 165,094 | 150,510 | ||
| Recognition of unearned revenue | $ (47,300) | $ (43,400) | (139,623) | (129,377) |
| Ending balance | $ 174,695 | $ 157,640 | $ 174,695 | $ 157,640 |
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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