GOODWILL AND INTANGIBLE ASSETS Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill	$ 632,740	$ 622,243
Gross Balance, December 31, 2015	1,095,309
Accumulated Impairment Losses, Beginning Balance	(473,066)
Foreign Currency	10,497
Accumulated Impairment Losses, Ending Balance	(473,066)
Gross Balance, June 30, 2016	1,105,806
BULGARIA [Member]
Goodwill [Roll Forward]
Goodwill	28,173	27,726
Gross Balance, December 31, 2015	172,365
Accumulated Impairment Losses, Beginning Balance	(144,639)
Foreign Currency	447
Accumulated Impairment Losses, Ending Balance	(144,639)
Gross Balance, June 30, 2016	172,812
CROATIA [Member]
Goodwill [Roll Forward]
Goodwill	567	551
Gross Balance, December 31, 2015	11,005
Accumulated Impairment Losses, Beginning Balance	(10,454)
Foreign Currency	16
Accumulated Impairment Losses, Ending Balance	(10,454)
Gross Balance, June 30, 2016	11,021
CZECH REPUBLIC [Member]
Goodwill [Roll Forward]
Goodwill	479,495	471,946
Gross Balance, December 31, 2015	759,491
Accumulated Impairment Losses, Beginning Balance	(287,545)
Foreign Currency	7,549
Accumulated Impairment Losses, Ending Balance	(287,545)
Gross Balance, June 30, 2016	767,040
ROMANIA [Member]
Goodwill [Roll Forward]
Goodwill	75,959	74,415
Gross Balance, December 31, 2015	85,443
Accumulated Impairment Losses, Beginning Balance	(11,028)
Foreign Currency	1,544
Accumulated Impairment Losses, Ending Balance	(11,028)
Gross Balance, June 30, 2016	86,987
SLOVAK REPUBLIC [Member]
Goodwill [Roll Forward]
Goodwill	48,546	47,605
Gross Balance, December 31, 2015	47,605
Accumulated Impairment Losses, Beginning Balance	0
Foreign Currency	941
Accumulated Impairment Losses, Ending Balance	0
Gross Balance, June 30, 2016	48,546
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, June 30, 2016	$ 19,400