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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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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GOODWILL (Details) - USD ($)		3 Months Ended
GOODWILL (Details) - USD ($)	Oct. 01, 2017	Mar. 31, 2018	Mar. 31, 2017
Goodwill [Roll Forward]
Goodwill, gross		$ 424,725,000
Accumulated impairment losses		(29,221,000)
Goodwill		395,504,000
Foreign currency translation adjustments		131,000
Goodwill, gross		424,856,000
Accumulated impairment losses		(44,734,000)
Goodwill		380,122,000
Goodwill impairment	$ 0	15,513,000	$ 0
FMS
Goodwill [Roll Forward]
Goodwill, gross		237,176,000
Accumulated impairment losses		(10,322,000)
Goodwill		226,854,000
Foreign currency translation adjustments		284,000
Goodwill, gross		237,460,000
Accumulated impairment losses		(25,835,000)
Goodwill		211,625,000
DTS
Goodwill [Roll Forward]
Goodwill, gross		40,808,000
Accumulated impairment losses		0
Goodwill		40,808,000
Foreign currency translation adjustments		0
Goodwill, gross		40,808,000
SCS
Goodwill [Roll Forward]
Goodwill, gross		146,741,000
Accumulated impairment losses		(18,899,000)
Goodwill		127,842,000
Foreign currency translation adjustments		(153,000)
Goodwill, gross		146,588,000
Accumulated impairment losses		(18,899,000)
Goodwill		127,689,000
Europe \| FMS
Goodwill [Roll Forward]
Goodwill impairment		$ 16,000,000