v3.20.2
REVENUE - Contract Balance (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Revenues [Abstract]    
Receivables not generated $ 2,200 $ 5,100
Receivables, included in "Accounts receivable net of allowance for doubtful accounts" 231,211 376,504
Unearned revenue - current 11,814 9,894
Unearned revenue - noncurrent $ 1,499 $ 2,113