DISCONTINUED OPERATIONS (Details-Disposal Groups) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Jun. 06, 2012
DISCONTINUED OPERATIONS
Cash and cash equivalents	$ 355,636	$ 159,611	$ 355,636	$ 159,611	$ 91,131	$ 206,975
Revenue and net income (loss) of discontinued operations
Revenue	0	0	(750)	1
Loss before income taxes	(1,059)	(1,769)	(2,494)	(3,619)
Income tax benefit	370	619	873	1,266
Loss from discontinued operations	(689)	$ (1,150)	(1,621)	$ (2,353)
Assets and liabilities of facilities reported as discontinued operations
Non-current assets of discontinued operations	3,781		3,781		3,781
Current liabilities	$ (12,899)		$ (12,899)		$ (11,711)
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DISCONTINUED OPERATIONS
Asset purchase agreement proceeds from sale							$ 55,900