SEGMENT DATA Total Assets (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	[1]	$ 1,558,386	$ 1,390,717
BULGARIA [Member]
Segment Reporting Information [Line Items]
Assets		139,982	130,873
CROATIA [Member]
Segment Reporting Information [Line Items]
Assets		60,255	49,135
CZECH REPUBLIC [Member]
Segment Reporting Information [Line Items]
Assets		801,045	700,190
ROMANIA [Member]
Segment Reporting Information [Line Items]
Assets		294,236	266,132
SLOVAK REPUBLIC [Member]
Segment Reporting Information [Line Items]
Assets		146,492	131,220
SLOVENIA [Member]
Segment Reporting Information [Line Items]
Assets		79,136	72,381
Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets	[1]	1,521,146	1,349,931
Corporate [Member]
Segment Reporting Information [Line Items]
Assets		$ 37,240	$ 40,786

[1] (1) Segment assets exclude any intercompany balances.