PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Short-term investments in real estate	$ 35,289	$ 29,405
Maintenance agreements, current portion	4,961	8,014
Income taxes receivable	11,396	9,227
Prepaid expenses	7,501	7,898
Other current assets	10,862	10,198
Total	$ 70,009	$ 64,742