INCOME TAXES, Uncertain Tax Positions and Interest and Penalties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes Uncertain Tax Positions and Tax Reform [Abstract]
Liabilities for uncertain tax positions - current	$ 1,400	$ 2,500
Liability for uncertain tax positions - noncurrent	27,553	27,948
Liability for uncertain positions expected to be resolved in next fiscal year	1,100
Interest and penalties uncertain tax positions recognized	1,300	900
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Liability for uncertain tax positions - beginning of period	30,430	27,828
Additions based on tax positions related to the current year	1,703	2,168
Additions relating to acquisitions	0	0
Translation adjustment - increase		804
Translation adjustment - decrease	(657)
Settlement/expiration of statutes of limitations	(2,525)	(370)
Liability for uncertain tax positions - end of period	28,951	30,430
Interest and Penalties [Abstract]
(Benefit) on reversal of interest and penalties	(300)	0
Accrued interest and penalties uncertain tax positions	3,800	3,200
Tax Year 2008 [Member]
Income Taxes Uncertain Tax Positions and Tax Reform [Abstract]
Liabilities for uncertain tax positions - current	1,000
Tax Year 2006 [Member]
Income Taxes Uncertain Tax Positions and Tax Reform [Abstract]
Liabilities for uncertain tax positions - current		1,100
Tax Year 2014 [Member]
Income Taxes Uncertain Tax Positions and Tax Reform [Abstract]
Liabilities for uncertain tax positions - current		$ 1,400
Tax Year 2015 [Member]
Income Taxes Uncertain Tax Positions and Tax Reform [Abstract]
Liabilities for uncertain tax positions - current	$ 100