ASSETS HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held-for-sale			$ 4,900
Impairment of assets-held-for-sale			2,600
Pre-tax loss from sale of discontinued operations			$ 0	$ 0	$ 27,593
SETA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	$ 7,200
Disposal Group, Including Discontinued Operation, Consideration	11,200
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 3,000
Discontinued Operations | Commercial Cyber Solutions | Hexis
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax loss from sale of discontinued operations		$ 5,500		$ 5,509