SEGMENT DATA Long Lived Assets (Details) - USD ($) $ in Thousands		Jun. 30, 2020		Dec. 31, 2019		Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Long-lived assets		$ 102,378	[1]	$ 113,901	[1]	$ 110,627	$ 117,604
Operating Segments
Segment Reporting Information [Line Items]
Long-lived assets	[1]	101,866		112,821
Operating Segments | Bulgaria
Segment Reporting Information [Line Items]
Long-lived assets		11,865		13,538
Operating Segments | Czech Republic
Segment Reporting Information [Line Items]
Long-lived assets		32,142		36,760
Operating Segments | Romania
Segment Reporting Information [Line Items]
Long-lived assets		29,300		31,115
Operating Segments | Slovak Republic
Segment Reporting Information [Line Items]
Long-lived assets		14,819		16,201
Operating Segments | Slovenia
Segment Reporting Information [Line Items]
Long-lived assets		13,740		15,207
Corporate
Segment Reporting Information [Line Items]
Long-lived assets		$ 512		$ 1,080

[1] ⁽¹⁾  Reflects property, plant and equipment, net.