INCOME TAXES, Uncertain Tax Positions and Interest and Penalties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Liabilities for uncertain tax positions current	$ 2,500	$ 400
Liability for uncertain tax positions noncurrent	27,948	27,458
Liability for uncertain positions expected to be resolved in next fiscal year	2,500
Interest and penalties uncertain tax positions recognized	900	1,300	$ 2,500
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Liability for uncertain tax positions - beginning of period	27,828	42,158	39,970
Additions based on tax positions related to the current year	2,168	2,483	3,241
Translation adjustment - increase	804
Translation adjustment - decrease		(881)	(844)
Settlement/expiration of statutes of limitations	(370)	(15,932)	(209)
Liability for uncertain tax positions - end of period	30,430	27,828	42,158	$ 39,970
Interest and Penalties [Abstract]
Benefit on reversal of interest and penalties	0	(3,100)
Accrued interest and penalties uncertain tax positions	3,200	2,200
Maximum [Member]
Interest and Penalties [Abstract]
Benefit on reversal of interest and penalties			$ (100)
Tax Year 2014 [Member]
Income Tax Contingency [Line Items]
Liabilities for uncertain tax positions current	1,400
Tax Year 2006 [Member]
Income Tax Contingency [Line Items]
Liabilities for uncertain tax positions current	1,100
Power Solutions [Member]
Income Tax Contingency [Line Items]
Reduction relating to settlement with taxing authorities	(13,900)
Reduction relating to interest and penalties uncertain tax positions	(11,100)
Interest and penalties uncertain tax positions recognized	$ 5,300
Interest and penalties uncertain tax positions recognized reversal		2,600
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Additions relating to acquisitions				$ 12,000
Interest and Penalties [Abstract]
Interest and penalties uncertain tax positions recognized until various tax matters are resolved		$ 2,100
Asia [Member] | Power Solutions [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Income tax audit, years under examination	2004
Asia [Member] | Power Solutions [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Income tax audit, years under examination	2006