INCOME TAXES (Schedule of Uncertain Tax Positions) (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended |
---|---|---|
Mar. 31, 2019 |
Dec. 31, 2018 |
|
Income Tax Disclosure [Abstract] | ||
Balance at January 1, | $ 8,499 | $ 579 |
Increases related to current year tax positions | 1,033 | 8,499 |
Decreases related to prior year tax positions | (579) | |
Closing balance | $ 9,532 | $ 8,499 |