DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS - Income Statement Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations	$ (11)	$ 1,960	$ 13,607	$ 1,125
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	99,074	108,463	188,524
Gross margin	0	37,621	38,663	70,051
Salaries and related	0	26,963	29,032	51,952
Other selling, general and administrative	0	7,368	8,355	14,318
Depreciation and amortization	0	608	680	1,193
Business reorganization	0	(2)	50	290
Operating income (loss)	0	2,684	546	2,298
Interest income (expense), net	0	(115)	(88)	(203)
Other non-operating income (loss)	0	7	216	(337)
Income (Loss) from discontinued operations before taxes and gain (loss) on sale	0	2,576	674	1,758
Gain (loss) from sale of discontinued operations	(11)	0	14,032	0
Income (loss) from discontinued operations before income taxes	(11)	2,576	14,706	1,758
Provision (benefit) for income taxes	0	616	1,099	633
Income (loss) from discontinued operations	$ (11)	$ 1,960	$ 13,607	$ 1,125