DISCONTINUED OPERATIONS (Details-Disposal Groups) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Jun. 06, 2012
DISCONTINUED OPERATIONS
Cash and cash equivalents	$ 174,226	$ 88,536	$ 206,975	$ 86,212
Revenue and net income (loss) of discontinued operations
Revenue	1	1
Loss before income taxes	(1,850)	(238)
Income tax benefit	647	12
Loss from discontinued operations	(1,203)	$ (226)
Assets and liabilities of facilities reported as discontinued operations
Current assets	64		110
Non-current assets of discontinued operations	4,142		4,142
Current liabilities	(14,896)		(13,401)
Non-current liabilities	$ (26)		$ (26)
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DISCONTINUED OPERATIONS
Asset Purchase Agreement Proceeds From Sale					$ 55,900