OVERVIEW AND BASIS OF PRESENTATION (TABLES) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 85,480	$ 78,237
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	95,797	$ 78,237	$ 93,879	$ 74,437
Prepaid Expenses and Other Current Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	10,305
Other Noncurrent Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 12