DISCONTINUED OPERATIONS (Details-Disposal Groups) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jun. 06, 2012
DISCONTINUED OPERATIONS
Cash and cash equivalents	$ 265,194		$ 265,194		$ 368,550
Revenue and net income (loss) of discontinued operations
Revenue	0	$ 0	0	$ (750)
Loss before income taxes	(3,334)	(1,555)	(11,733)	(4,049)
Income tax benefit	700	544	2,464	1,417
Loss from discontinued operations	(2,634)	$ (1,011)	(9,269)	$ (2,632)
Assets and liabilities of facilities reported as discontinued operations
Non-current assets of discontinued operations	2,428		2,428		2,428
Current liabilities	$ (18,988)		$ (18,988)		$ (14,507)
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DISCONTINUED OPERATIONS
Asset purchase agreement proceeds from sale						$ 55,900