GOODWILL AND INTANGIBLE ASSETS Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill	$ 610,282	$ 602,069
Gross Balance, December 31, 2016	1,075,135
Accumulated Impairment Losses, Beginning Balance	(473,066)
Foreign Currency	8,213
Accumulated Impairment Losses, Ending Balance	(473,066)
Gross Balance, March 31, 2017	1,083,348
BULGARIA [Member]
Goodwill [Roll Forward]
Goodwill	27,130	26,750
Gross Balance, December 31, 2016	171,389
Accumulated Impairment Losses, Beginning Balance	(144,639)
Foreign Currency	380
Accumulated Impairment Losses, Ending Balance	(144,639)
Gross Balance, March 31, 2017	171,769
CROATIA [Member]
Goodwill [Roll Forward]
Goodwill	556	534
Gross Balance, December 31, 2016	10,988
Accumulated Impairment Losses, Beginning Balance	(10,454)
Foreign Currency	22
Accumulated Impairment Losses, Ending Balance	(10,454)
Gross Balance, March 31, 2017	11,010
CZECH REPUBLIC [Member]
Goodwill [Roll Forward]
Goodwill	463,393	456,938
Gross Balance, December 31, 2016	744,483
Accumulated Impairment Losses, Beginning Balance	(287,545)
Foreign Currency	6,455
Accumulated Impairment Losses, Ending Balance	(287,545)
Gross Balance, March 31, 2017	750,938
ROMANIA [Member]
Goodwill [Roll Forward]
Goodwill	72,456	71,758
Gross Balance, December 31, 2016	82,786
Accumulated Impairment Losses, Beginning Balance	(11,028)
Foreign Currency	698
Accumulated Impairment Losses, Ending Balance	(11,028)
Gross Balance, March 31, 2017	83,484
SLOVAK REPUBLIC [Member]
Goodwill [Roll Forward]
Goodwill	46,747	46,089
Gross Balance, December 31, 2016	46,089
Accumulated Impairment Losses, Beginning Balance	0
Foreign Currency	658
Accumulated Impairment Losses, Ending Balance	0
Gross Balance, March 31, 2017	46,747
SLOVENIA [Member]
Goodwill [Roll Forward]
Goodwill	0	$ 0
Gross Balance, December 31, 2016	19,400
Accumulated Impairment Losses, Beginning Balance	(19,400)
Foreign Currency	0
Accumulated Impairment Losses, Ending Balance	(19,400)
Gross Balance, March 31, 2017	$ 19,400