Annual report pursuant to Section 13 and 15(d)

REVENUE (Details 3)

v3.19.3.a.u2
REVENUE (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Balance at beginning of year $ 127,075 $ 117,614
Deferral of unearned revenue 174,404 166,053
Recognition of unearned revenue (164,972) (156,592)
Balance at end of year $ 136,507 $ 127,075