SEGMENT DATA Capital Expenditure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Capital expenditures	$ 4,365	$ 5,369
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	66	153
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	4,299	5,216
Operating Segments | Bulgaria
Segment Reporting Information [Line Items]
Capital expenditures	774	451
Operating Segments | Czech Republic
Segment Reporting Information [Line Items]
Capital expenditures	1,687	2,507
Operating Segments | Romania
Segment Reporting Information [Line Items]
Capital expenditures	417	576
Operating Segments | Slovak Republic
Segment Reporting Information [Line Items]
Capital expenditures	202	411
Operating Segments | SLOVENIA
Segment Reporting Information [Line Items]
Capital expenditures	$ 1,219	$ 1,271