DISCONTINUED OPERATIONS (Details-Disposal Groups) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Jun. 06, 2012
DISCONTINUED OPERATIONS
Cash and cash equivalents	$ 345,239	$ 176,925	$ 345,239	$ 176,925	$ 91,131	$ 206,975
Revenue and net income (loss) of discontinued operations
Revenue	0	1,834	(750)	1,835
Loss before income taxes	(1,555)	(1,021)	(4,049)	(4,640)
Income tax benefit	544	357	1,417	1,623
Loss from discontinued operations	(1,011)	$ (664)	(2,632)	$ (3,017)
Assets and liabilities of facilities reported as discontinued operations
Non-current assets of discontinued operations	3,781		3,781		3,781
Current liabilities	$ (13,396)		$ (13,396)		$ (11,711)
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DISCONTINUED OPERATIONS
Asset purchase agreement proceeds from sale							$ 55,900