SEGMENT DATA Capital Expenditure (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 7,834	$ 11,976
Bulgaria
Segment Reporting Information [Line Items]
Capital expenditures	1,349	2,019
Czech Republic
Segment Reporting Information [Line Items]
Capital expenditures	3,539	5,088
Romania
Segment Reporting Information [Line Items]
Capital expenditures	1,528	2,966
Slovak Republic
Segment Reporting Information [Line Items]
Capital expenditures	1,080	900
Total operating segments
Segment Reporting Information [Line Items]
Capital expenditures	7,496	10,973
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	$ 338	$ 1,003