PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Short-term investments in real estate	$ 29,405	$ 13,025
Maintenance agreements, current portion	8,014	6,590
Income taxes receivable	9,227	5,186
Prepaid expenses	7,898	6,919
Litigation settlement insurance recovery	0	4,000
Other current assets	10,198	6,888
Total	$ 64,742	$ 42,608