v3.19.3.a.u2
EARNINGS (LOSS) PER SHARE (Details) - USD ($)
 3 Months Ended 4 Months Ended 12 Months Ended
Sep. 14, 2018
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                          
Net earnings (loss)   $ (13,500,000) $ (54,800,000) $ 49,400,000 $ (130,200,000) $ 170,600,000 $ (100,400,000) $ 22,200,000 $ 17,700,000   $ (149,100,000) $ 110,100,000 $ (487,200,000)
Net earnings (loss) for diluted earnings (loss) per share                     $ (149,100,000) 53,400,000 $ (487,200,000)
Calculation of Net earnings for diluted earnings (loss) per share                          
Marked-to--market (gain) on derivative liability                       (66,400,000)  
Interest expense for Convertible Notes due 2024                       $ 9,700,000  
Denominator (shares in thousands):                          
Weighted average shares for basic earnings per common share   103,850,000 103,850,000 103,845,000 103,783,000 103,514,000 123,126,000 128,039,000 128,046,000   103,832,000 120,621,000 128,246,000
Common equivalent shares for RSUs and PSUs                       29,000  
Common equivalent shares if-converted: convertible notes 2024                       9,455,000  
Weighted average shares for diluted earnings per common share   103,850,000 103,850,000 135,528,000 103,783,000 135,450,000 123,126,000 128,105,000 128,046,000   103,832,000 130,105,000 128,246,000
Basic earnings (loss) per common share (in dollars per share)                     $ (1.44) $ 0.91 $ (3.80)
Diluted earnings (loss) per common share (in dollars per share)                     $ (1.44) $ 0.41 $ (3.80)
Interest expense                     $ 292,800,000 $ 262,300,000 $ 231,600,000
Marked-to-market (gain) on derivative liability                     $ (5,800,000) (111,400,000)  
2.95% Senior Unsecured Convertible Notes due 2024                          
Calculation of Net earnings for diluted earnings (loss) per share                          
Interest expense for Convertible Notes due 2024                       $ 9,700,000  
Denominator (shares in thousands):                          
Anti-dilutive securities not included in the computations of diluted earnings per share (in shares)                     31,700,000 9,500,000  
Interest expense $ 32,600,000                 $ 9,700,000 $ 32,600,000    
Marked-to-market (gain) on derivative liability                     $ 23,500,000 $ 66,400,000  
2.95% Senior Unsecured Convertible Notes due 2024 | Class A common stock                          
Denominator (shares in thousands):                          
Conversion rate (in dollars per share) $ 18.95 $ 18.95                 $ 18.95    
Number of shares upon conversion                     31,662,269    
Performance Vesting                          
Denominator (shares in thousands):                          
Anti-dilutive securities not included in the computations of diluted earnings per share (in shares)                     477,630 364,269 187,468
Restricted stock unit                          
Denominator (shares in thousands):                          
Anti-dilutive securities not included in the computations of diluted earnings per share (in shares)                     1,377,992 210,558 88,194