DIVESTITURES (Details) - USD ($)			12 Months Ended
	Jun. 15, 2015	May 07, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Business			$ 0	$ 0	$ 19,835,000
Hudson Information Technology (US) Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of business	$ 16,977,000
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, before Income Tax					(130,000)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal					15,918,000
Disposal Group, Not Discontinued Operation, Tax Expense (Benefit)					11,000
Netherlands Business Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of business		$ 9,029,000
Proceeds From Divestiture of Business, Cash Retained					1,135,000
Gain (Loss) on Disposition of Business					2,841,000
Disposal Group, Not Discontinued Operation, Tax Expense (Benefit)					0
Netherlands subsidiary
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, before Income Tax					373,000
Foreign Currency Gain (Loss) [Member] | Netherlands Business Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax					(2,799,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Exit of Business in Central and Eastern Europe [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax					1,208,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Exit of Business in Luxembourg [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax					$ (132,000)