GOODWILL AND INTANGIBLE ASSETS (Schedule of Goodwill by Reportable Business Segment) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill gross value		$ 478,839
Accumulated impairment losses	$ (92,423)
Goodwill [Roll Forward]
Carrying value	386,416
Modality acquisition	32,188
Adjustments to prior acquisitions	580
Impact of currency fluctuations	(1,485)
Carrying value	417,699
North America
Goodwill [Line Items]
Goodwill gross value		428,511
Accumulated impairment losses	(92,423)
Goodwill [Roll Forward]
Carrying value	336,088
Modality acquisition	2,153
Adjustments to prior acquisitions	580
Impact of currency fluctuations	(1,442)
Carrying value	337,379
Europe
Goodwill [Line Items]
Goodwill gross value		44,433
Accumulated impairment losses	0
Goodwill [Roll Forward]
Carrying value	44,433
Modality acquisition	29,858
Adjustments to prior acquisitions	0
Impact of currency fluctuations	237
Carrying value	74,528
Asia Pacific
Goodwill [Line Items]
Goodwill gross value		$ 5,895
Accumulated impairment losses	0
Goodwill [Roll Forward]
Carrying value	5,895
Modality acquisition	177
Adjustments to prior acquisitions	0
Impact of currency fluctuations	(280)
Carrying value	$ 5,792

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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