PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Short-term investments in real estate	$ 51,688	$ 29,405
Maintenance agreements, current portion	3,860	8,014
Income taxes receivable	8,354	9,227
Prepaid expenses	7,070	7,898
Other current assets	10,650	10,198
Total	$ 81,622	$ 64,742