Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax Credit Carryforward [Line Items]      
Undistributed earnings of foreign subsidiaries indefinitely invested $ 85,700,000    
Deferred tax liability not recognized, amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries 6,400,000    
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings 0    
Research and development costs 30,300,000 $ 26,700,000  
Deferred tax asset related to net operating loss and capital loss and foreign tax credit carryforwards and research and development credit 373,900,000    
Deferred tax asset valuation allowance 431,900,000 401,800,000  
Cash paid for income taxes, net of amounts refunded 59,600,000 215,700,000 $ 173,400,000
Unrecognized tax benefits 24,900,000 38,000,000  
Unrecognized tax benefits, interest and penalties 2,600,000 3,000,000  
Unrecognized tax benefits that would have affected the effective tax rate 23,800,000 35,700,000  
Unrecognized tax benefits that would impact effective tax rate, income tax penalties and interest accrued 2,300,000 2,600,000  
Income tax, penalties and interest accrued 900,000 1,400,000  
Tax Cuts and Jobs Act of 2017, reduction in net deferred tax liability   $ 85,100,000  
Minimum      
Tax Credit Carryforward [Line Items]      
Decrease unrecognized tax benefits is reasonably possible 0    
Increase in unrecognized tax benefits is reasonably possible 0    
Maximum      
Tax Credit Carryforward [Line Items]      
Decrease unrecognized tax benefits is reasonably possible 4,100,000    
Increase in unrecognized tax benefits is reasonably possible 4,100,000    
Operating Loss and Capital Loss and Foreign Tax Credit Carryforwards and Research and Development Credit      
Tax Credit Carryforward [Line Items]      
Deferred tax asset valuation allowance 310,200,000    
Foreign Country      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 1,114,900,000    
Expire At Various Times Between 2021 and 2038 | United States Federal      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 134,500,000    
Expire At Various Times Between 2019 and 2038 | Foreign Country      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 399,100,000    
Net Operating Loss Indefinite Life | Foreign Country      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 715,800,000    
Net Operating Loss Indefinite Life | State      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 1,800,000    
Capital Loss Indefinite Life | Foreign Country      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 15,700,000    
Expire in 2018 | State      
Tax Credit Carryforward [Line Items]      
Capital loss carryforwards 2,500,000    
Expire in Years 2025 through 2026 | Foreign Country      
Tax Credit Carryforward [Line Items]      
Tax credit carryforward $ 16,800,000