XML 42 R30.htm IDEA: XBRL DOCUMENT v3.21.2
REVENUE - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Deferred revenue from contracts with customers:        
Beginning balance $ 165,330 $ 175,321 $ 145,493 $ 162,068
Revenue recognized, included in beginning balance (55,762) (59,155) (60,185) (76,053)
Additions, net of revenue recognized during period, and other 40,163 61,864 64,423 92,015
Ending balance $ 149,731 $ 178,030 $ 149,731 $ 178,030