GOODWILL AND INTANGIBLE ASSETS Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	$ 1,095,309	$ 1,154,464
Accumulated Impairment Losses, Beginning Balance	(473,066)	(473,066)
Goodwill, Net Beginning Balance	602,069	622,243	$ 681,398
Foreign Currency	(20,174)	(59,155)
Accumulated Impairment Losses, Ending Balance	(473,066)	(473,066)
Goodwill, Gross Ending Balance	1,075,135	1,095,309
BULGARIA
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	172,365	175,494
Accumulated Impairment Losses, Beginning Balance	(144,639)	(144,639)
Goodwill, Net Beginning Balance	26,750	27,726	30,855
Foreign Currency	(976)	(3,129)
Accumulated Impairment Losses, Ending Balance	(144,639)	(144,639)
Goodwill, Gross Ending Balance	171,389	172,365
CROATIA
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	11,005	11,065
Accumulated Impairment Losses, Beginning Balance	(10,454)	(10,454)
Goodwill, Net Beginning Balance	534	551	611
Foreign Currency	(17)	(60)
Accumulated Impairment Losses, Ending Balance	(10,454)	(10,454)
Goodwill, Gross Ending Balance	10,988	11,005
CZECH REPUBLIC
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	759,491	800,640
Accumulated Impairment Losses, Beginning Balance	(287,545)	(287,545)
Goodwill, Net Beginning Balance	456,938	471,946	513,095
Foreign Currency	(15,008)	(41,149)
Accumulated Impairment Losses, Ending Balance	(287,545)	(287,545)
Goodwill, Gross Ending Balance	744,483	759,491
ROMANIA
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	85,443	94,777
Accumulated Impairment Losses, Beginning Balance	(11,028)	(11,028)
Goodwill, Net Beginning Balance	71,758	74,415	83,749
Foreign Currency	(2,657)	(9,334)
Accumulated Impairment Losses, Ending Balance	(11,028)	(11,028)
Goodwill, Gross Ending Balance	82,786	85,443
Slovak Republic [Member]
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	47,605	53,088
Accumulated Impairment Losses, Beginning Balance	0	0
Goodwill, Net Beginning Balance	46,089	47,605	53,088
Foreign Currency	(1,516)	(5,483)
Accumulated Impairment Losses, Ending Balance	0	0
Goodwill, Gross Ending Balance	46,089	47,605
Slovenia [Member]
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	19,400	19,400
Accumulated Impairment Losses, Beginning Balance	(19,400)	(19,400)
Goodwill, Net Beginning Balance	0	0	$ 0
Foreign Currency	0	0
Accumulated Impairment Losses, Ending Balance	(19,400)	(19,400)
Goodwill, Gross Ending Balance	$ 19,400	$ 19,400