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GOODWILL (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
GOODWILL (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill [Roll Forward]
Goodwill, gross				$ 424,725
Accumulated impairment losses				(29,221)
Goodwill				395,504
Acquisitions				113,057
Foreign currency translation adjustments				121
Goodwill, gross		$ 537,903		537,903
Accumulated impairment losses		(44,734)		(44,734)
Goodwill		493,169		493,169
Goodwill impairment charge	$ 0	0	$ 0	15,513	$ 0
FMS
Goodwill [Roll Forward]
Goodwill, gross				237,176
Accumulated impairment losses				(10,322)
Goodwill				226,854
Acquisitions				31,209
Foreign currency translation adjustments				279
Goodwill, gross		268,664		268,664
Accumulated impairment losses		(25,835)		(25,835)
Goodwill		242,829		242,829
DTS
Goodwill [Roll Forward]
Goodwill, gross				40,808
Accumulated impairment losses				0
Goodwill				40,808
Acquisitions				0
Foreign currency translation adjustments				0
Goodwill, gross		40,808		40,808
Goodwill		40,808		40,808
SCS
Goodwill [Roll Forward]
Goodwill, gross				146,741
Accumulated impairment losses				(18,899)
Goodwill				127,842
Acquisitions				81,848
Foreign currency translation adjustments				(158)
Goodwill, gross		228,431		228,431
Accumulated impairment losses		(18,899)		(18,899)
Goodwill		$ 209,532		209,532
Europe \| FMS
Goodwill [Roll Forward]
Goodwill impairment charge				$ 16,000