Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT (Debt Extinguishment) (Details)

v3.10.0.1
LONG-TERM DEBT (Debt Extinguishment) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2016
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Payment of Accrued Interest and Fees   $ 20,800,000      
Cash available for general corporate purposes $ 256,900,000 492,500,000      
Loss on extinguishment of debt     $ 2,471,000 $ 1,048,000 $ 14,049,000
5.625% Senior Notes Due 2026 [Member]          
Debt Instrument [Line Items]          
Face amount   $ 300,000,000      
Interest rate, stated percentage   5.625% 5.625%    
2.5% Convertible Senior Notes Due 2023 [Member]          
Debt Instrument [Line Items]          
Face amount   $ 550,000,000 $ 550,000,000    
Interest rate, stated percentage   2.50% 2.50%    
5.625% Senior Notes Due 2026 & 2.5% Convertible Senior Notes Due 2023 [Member]          
Debt Instrument [Line Items]          
Proceeds from Issuance of Debt   $ 850,000,000      
2.5% Convertible Senior Notes Due 2019 [Member]          
Debt Instrument [Line Items]          
Interest rate, stated percentage   2.50%   2.50% 2.50%
Extinguishment of debt   $ 246,300,000.0      
Redemption Premium Payment, Extinguishment of Debt   $ 90,400,000      
4.875% Senior Notes Due 2024 [Member]          
Debt Instrument [Line Items]          
Face amount $ 575,000,000   $ 575,000,000    
Interest rate, stated percentage 4.875%   4.875%    
7% Senior Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Interest rate, stated percentage 7.00%        
Extinguishment of debt $ 425,000,000        
Redemption Premium Payment, Extinguishment of Debt 14,900,000        
Senior Secured Credit Facility [Member] | 4.875% Senior Notes Due 2024 [Member]          
Debt Instrument [Line Items]          
Proceeds from Issuance of Debt 858,500,000        
Old Senior Secured Credit Facility Term Loans A and B [Member]          
Debt Instrument [Line Items]          
Extinguishment of debt 123,300,000        
Old Senior Secured Credit Facility Term Loans A and B [Member] | 7% Senior Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Payment of Accrued Interest and Fees $ 38,400,000