GOODWILL AND INTANGIBLE ASSETS Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill	$ 650,785	$ 622,243
Gross Balance, December 31, 2015	1,095,309
Accumulated Impairment Losses, Beginning Balance	(473,066)
Foreign Currency	28,542
Accumulated Impairment Losses, Ending Balance	(473,066)
Gross Balance, March 31, 2016	1,123,851
BULGARIA [Member]
Goodwill [Roll Forward]
Goodwill	28,890	27,726
Gross Balance, December 31, 2015	172,365
Accumulated Impairment Losses, Beginning Balance	(144,639)
Foreign Currency	1,164
Accumulated Impairment Losses, Ending Balance	(144,639)
Gross Balance, March 31, 2016	173,529
CROATIA [Member]
Goodwill [Roll Forward]
Goodwill	579	551
Gross Balance, December 31, 2015	11,005
Accumulated Impairment Losses, Beginning Balance	(10,454)
Foreign Currency	28
Accumulated Impairment Losses, Ending Balance	(10,454)
Gross Balance, March 31, 2016	11,033
CZECH REPUBLIC [Member]
Goodwill [Roll Forward]
Goodwill	493,140	471,946
Gross Balance, December 31, 2015	759,491
Accumulated Impairment Losses, Beginning Balance	(287,545)
Foreign Currency	21,194
Accumulated Impairment Losses, Ending Balance	(287,545)
Gross Balance, March 31, 2016	780,685
ROMANIA [Member]
Goodwill [Roll Forward]
Goodwill	78,388	74,415
Gross Balance, December 31, 2015	85,443
Accumulated Impairment Losses, Beginning Balance	(11,028)
Foreign Currency	3,973
Accumulated Impairment Losses, Ending Balance	(11,028)
Gross Balance, March 31, 2016	89,416
SLOVAK REPUBLIC [Member]
Goodwill [Roll Forward]
Goodwill	49,788	47,605
Gross Balance, December 31, 2015	47,605
Accumulated Impairment Losses, Beginning Balance	0
Foreign Currency	2,183
Accumulated Impairment Losses, Ending Balance	0
Gross Balance, March 31, 2016	49,788
SLOVENIA [Member]
Goodwill [Roll Forward]
Goodwill	0	$ 0
Gross Balance, December 31, 2015	19,400
Accumulated Impairment Losses, Beginning Balance	(19,400)
Foreign Currency	0
Accumulated Impairment Losses, Ending Balance	(19,400)
Gross Balance, March 31, 2016	$ 19,400