Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Narrative) (Details)

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INCOME TAXES (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Examination [Line Items]        
Domestic income (loss) before income taxes   $ 43,500 $ (132,600) $ 1,100
Foreign income (loss) before taxes   $ 87,600 $ 123,200 $ 47,200
United States statutory income tax rates   21.00% 35.00% 35.00%
United States tax reform rate change $ (55,700) $ 0 $ (55,685) $ 0
Net deferred tax liability acquired in business combinations   4,000 $ 9,000  
Net operating loss carryforwards - United States federal   95,000    
Net operating loss carryforwards - state   47,800    
Net operating loss carryforwards - foreign   $ 245,700    
Minimum [Member]        
Income Tax Examination [Line Items]        
Operating loss carryforwards, expiration date   Dec. 31, 2025    
Major tax jurisdictions [Member] | Minimum [Member]        
Income Tax Examination [Line Items]        
Tax years remain open to examination   2009    
Major tax jurisdictions [Member] | Maximum [Member]        
Income Tax Examination [Line Items]        
Tax years remain open to examination   2018