SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 2 (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) Unit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cash and Cash Equivalents [Abstract]
Maximum maturity period for classification of cash equivalents		3 months
Restricted Cash [Abstract]
Restricted cash in long-term assets		$ 32,802,000	$ 20,252,000
Advertising Costs [Abstract]
Advertising expense		$ 27,000,000	28,000,000	$ 28,200,000
Goodwill and Other Intangible Assets [Abstract]
Impairment of goodwill			$ 9,900,000
Number of units impaired | Unit	1
Goodwill impairment loss pre tax charge	$ 200,000