SEGMENT DATA Long Lived Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	[1]	$ 1,488,361		$ 1,628,055
Long-lived assets		117,604	[2]	119,349	[2]	$ 103,258
BULGARIA
Segment Reporting Information [Line Items]
Assets	[1]	142,165		155,885
Long-lived assets	[2]	10,627		7,863
CZECH REPUBLIC
Segment Reporting Information [Line Items]
Assets	[1]	771,286		842,716
Long-lived assets	[2]	39,314		46,146
ROMANIA
Segment Reporting Information [Line Items]
Assets	[1]	297,937		307,286
Long-lived assets	[2]	33,368		28,515
Slovak Republic [Member]
Segment Reporting Information [Line Items]
Assets	[1]	146,252		149,866
Long-lived assets	[2]	16,376		17,450
SLOVENIA
Segment Reporting Information [Line Items]
Assets	[1]	89,440		88,158
Long-lived assets	[2]	15,955		15,701
Total operating segments [Member]
Segment Reporting Information [Line Items]
Assets	[1]	1,447,080		1,543,911
Long-lived assets	[2]	115,640		115,675
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	[1]	41,281		24,451
Long-lived assets	[2]	$ 1,964		$ 3,674

[1] Segment assets exclude any intercompany balances.

[2] Reflects property, plant and equipment, net.