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DISPOSITION OF BUSINESS (Income (Loss) Attributable to Catalyst Services) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Catalyst Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income before provision for income taxes $ 290 $ 2,520 $ 358