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Earnings (Loss) Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Net income (loss) $ (20,700,000) $ 19,400,000 $ (55,300,000) $ 19,100,000
Amount allocated to common stockholders (as percent) 100.00% 92.20% 100.00% 92.20%
Basic EPS:        
Net income (loss) allocated to common stockholders $ (20,700,000) $ 17,900,000 $ (55,300,000) $ 17,600,000
Net income (loss) allocated to common stockholders (shares) 88,800,000 87,600,000 88,500,000 87,600,000
Net income (loss) allocated to common stockholders (per share) $ (0.23) $ 0.20 $ (0.63) $ 0.20
Effect of Dilutive Securities:        
Share-based compensation $ 0 $ 0 $ 0 $ 0
Share-based compensation (shares) 0 800,000 0 800,000
Diluted EPS:        
Net income (loss) allocated to common stockholders $ (20,700,000) $ 17,900,000 $ (55,300,000) $ 17,600,000
Net income (loss) allocated to common stockholders (shares) 88,800,000 88,400,000 88,500,000 88,400,000
Net income (loss) allocated to common stockholders (per share) $ (0.23) $ 0.20 $ (0.63) $ 0.20
Securities excluded from calculation of diluted EPS (shares) 700,000 600,000 600,000 600,000