ACQUISITION (Details) - Heidrive € in Thousands, $ in Thousands		3 Months Ended
Jan. 12, 2016 USD ($)	Jan. 12, 2016 EUR (€)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Jan. 12, 2016 EUR (€)
ACQUISITION
Acquisition cost	$ 18,534	€ 17,068
Cash paid for acquisition, net	8,470	€ 7,800
Borrowings used to fund acquisition	$ 10,859				€ 10,000
Adjustments to purchase price			$ 0	€ 0

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration