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GOODWILL (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
GOODWILL (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill [Roll Forward]
Goodwill, gross				$ 424,725
Accumulated impairment losses				(29,221)
Goodwill				395,504
Acquisitions				100,431
Foreign currency translation adjustments				(71)
Goodwill, gross		$ 525,085		525,085
Accumulated impairment losses		(44,734)		(44,734)
Goodwill		480,351		480,351
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				29,902
Foreign currency translation adjustments				189
Goodwill, gross		267,267		267,267
Accumulated impairment losses		(25,835)		(25,835)
Goodwill		241,432		241,432
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
SCS
Goodwill [Roll Forward]
Goodwill, gross				146,741
Accumulated impairment losses				(18,899)
Goodwill				127,842
Acquisitions				70,529
Foreign currency translation adjustments				(260)
Goodwill, gross		217,010		217,010
Accumulated impairment losses		(18,899)		(18,899)
Goodwill		$ 198,111		198,111
Europe \| FMS
Goodwill [Roll Forward]
Goodwill impairment charge				$ 16,000