Quarterly report pursuant to Section 13 or 15(d)

UNEARNED REVENUE (Details)

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UNEARNED REVENUE (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Unearned Revenue    
Balance at beginning of year $ 149,224 $ 136,507
Deferral of unearned revenue 116,034 105,928
Recognition of unearned revenue (92,307) (85,936)
Balance at end of period $ 172,951 $ 156,499