SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Maximum maturity period for classification of cash equivalents	3 months
Restricted Cash [Abstract]
Restricted cash in long-term assets	$ 15,000	$ 11,600
Advertising Costs [Abstract]
Advertising expense	$ 29,800	$ 29,400	$ 27,000