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Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic EPS calculation        
Net income (loss) $ 9,836 $ (18,864) $ (24,367) $ (199,065)
Weighted-average shares of common stock outstanding (in shares) 80,242 79,879 80,277 79,776
Basic income (loss) per share (in dollars per share) $ 0.12 $ (0.24) $ (0.30) $ (2.50)
Diluted EPS calculation        
Net income (loss) $ 9,836 $ (18,864) $ (24,367) $ (199,065)
Weighted-average shares of common stock outstanding (in shares) 80,242 79,879 80,277 79,776
Dilutive effect of potentially dilutive securities (in shares) 2,656 0 0 0
Weighted-average common shares outstanding - diluted (in shares) 82,898 79,879 80,277 79,776
Diluted (income) loss per share (in dollars per share) $ 0.12 $ (0.24) $ (0.30) $ (2.50)
Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs)        
Diluted EPS calculation        
Potentially dilutive securities (in shares)   200 2,400 200