DISCONTINUED OPERATIONS (Details-Disposal Groups) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 06, 2012
DISCONTINUED OPERATIONS
Cash and cash equivalents	$ 293,301		$ 293,301		$ 368,550
Revenue and net income (loss) of discontinued operations
Revenue	0	$ 0	0	$ (750)
Loss before income taxes	(2,914)	(1,059)	(8,399)	(2,494)
Income tax benefit	612	370	1,764	873
Loss from discontinued operations	(2,302)	$ (689)	(6,635)	$ (1,621)
Assets and liabilities of facilities reported as discontinued operations
Non-current assets of discontinued operations	2,428		2,428		2,428
Current liabilities	$ (18,782)		$ (18,782)		$ (14,507)
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DISCONTINUED OPERATIONS
Asset purchase agreement proceeds from sale						$ 55,900