INCOME TAXES, Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income (Loss) Before income Taxes [Abstract]
(Loss) earnings before (benefit) provision for income taxes included (loss) earnings from domestic operations	$ (2,000)	$ (43,300)	$ 6,100
(Loss) earnings before (benefit) provision for income taxes from foreign operations	11,700	(39,200)	19,600
Current [Abstract]
Federal	16,055	(1,163)	1,494
State	115	18	70
Foreign	5,685	(10,172)	5,327
Total	21,855	(11,317)	6,891
Deferred [Abstract]
Federal	(1,312)	(6,272)	1,019
State	(329)	(464)	(64)
Foreign	1,326	335	(1,311)
Total	(315)	(6,401)	(356)
Tax (benefit) provision computed at the Company's effective tax rate	21,540	(17,718)	6,535
Reconciliation of taxes on income computed at the federal statutory rate [Abstract]
Tax (benefit) provision computed at the federal statutory rate	3,375	(28,893)	9,006
Increase (decrease) in taxes resulting from [Abstract]
Different tax rates applicable to foreign operations	(2,531)	(4,427)	(5,353)
Impairment of goodwill & intangibles	0	30,445	0
Increase in (reversal of) liability for uncertain tax positions - net	1,082	(13,974)	3,032
Impact of U.S. Tax Reform	19,171	0	0
Utilization of research and experimentation, solar and foreign tax credits	(272)	(349)	(349)
State taxes, net of federal benefit	(261)	(420)	56
Foreign tax on gain, net of federal benefit	1,223	0	0
Current year (reversal) increase in U.S. valuation allowances	0	0	(343)
Federal tax on profit of foreign disregarded entities net of deferred tax	0	0	872
Other, including qualified production activity credits, SERP/COLI income, under/(over) accruals, unrealized foreign exchange gains and amortization of purchase accounting intangibles	(247)	(100)	(386)
Tax (benefit) provision computed at the Company's effective tax rate	$ 21,540	$ (17,718)	$ 6,535
Increase (decrease) in effective tax rate resulting from [Abstract]
Tax provision computed at the federal statutory rate, percentage	35.00%	35.00%	35.00%
Different tax rates applicable to foreign operations, percentage	(26.00%)	5.00%	(21.00%)
Impairment of goodwill & intangibles, percentage	0.00%	(37.00%)	0.00%
Increase in (reversal of) liability for uncertain tax positions - net, percentage	11.00%	17.00%	12.00%
Impact of U.S. Tax Reform, percentage	199.00%	0.00%	0.00%
Utilization of research and development, solar and foreign tax credits, percentage	(3.00%)	0.00%	(1.00%)
State taxes, net of federal benefit, percentage	(3.00%)	1.00%	0.00%
Foreign tax on gain, net of federal benefit, percentage	13.00%	0.00%	0.00%
Current year (reversal) increase in U.S. valuation allowance, percentage	0.00%	0.00%	(1.00%)
Federal tax on profit of foreign disregarded entities net of deferred tax, percentage	0.00%	0.00%	3.00%
Other, including qualified production activity credits, SERP/COLI income, under/(over) accruals, unrealized foreign exchange gains and amortization of purchase accounting intangibles, percentage	(3.00%)	0.00%	(2.00%)
Tax (benefit) provision computed at the Company's effective tax rate, percentage	223.00%	21.00%	25.00%