Quarterly report pursuant to Section 13 or 15(d)

UNEARNED REVENUE (Details)

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UNEARNED REVENUE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Unearned Revenue    
Balance at beginning of year $ 149,224 $ 136,507
Deferral of unearned revenue 55,379 49,552
Recognition of unearned revenue (45,837) (42,707)
Balance at end of period $ 158,766 $ 143,352