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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Maintenance agreements, current portion $ 6,008 $ 6,590
Short-term investments in real estate 15,114 13,025
Income taxes receivable 13,054 5,186
Prepaid expenses 7,950 6,919
Litigation settlement insurance recovery 0 4,000
Other current assets 7,293 6,888
Total $ 49,419 $ 42,608