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 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Unearned Revenue          
Balance at beginning of year     $ 136,507 $ 127,075 $ 127,075
Deferral of unearned revenue     105,928 100,188 174,404
Recognition of unearned revenue $ 43,200 $ 40,500 (85,936) (80,496) (164,972)
Balance at end of period $ 156,499 $ 146,767 $ 156,499 $ 146,767 $ 136,507