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Earnings (Loss) Per Share - Calculation of EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net (loss) income attributable to common stockholders $ (209,897) $ (80,437) $ (72,782) $ (34,559) $ 134,053 $ 11,529 $ 28,960 $ 8,945 $ (397,675) $ 183,487 $ 87,784
Dividends declared on unvested share-based compensation                 0 (132) 0
Net (loss) income available to common stockholders                 $ (397,675) $ 183,355 $ 87,784
Denominator:                      
Weighted-average number of common shares outstanding—basic (in shares)                 201,670,721 202,009,750 205,462,911
Effect of dilutive securities:                      
Weighted-average number of common shares outstanding—diluted (in shares)                 201,670,721 202,741,630 206,131,150
(Loss) earnings per share:                      
Net (loss) income per share available to common stockholders—basic (in dollars per share) $ (1.04) $ (0.40) $ (0.36) $ (0.17) $ 0.67 $ 0.06 $ 0.14 $ 0.04 $ (1.97) $ 0.91 $ 0.43
Net (loss) income per share available to common stockholders—diluted (in dollars per share) $ (1.04) $ (0.40) $ (0.36) $ (0.17) $ 0.66 $ 0.06 $ 0.14 $ 0.04 $ (1.97) $ 0.90 $ 0.43
Unvested restricted common stock                      
Effect of dilutive securities:                      
Unvested restricted common stock and shares related to unvested PSUs (in shares)                 0 156,146 215,655
Shares related to unvested PSUs                      
Effect of dilutive securities:                      
Unvested restricted common stock and shares related to unvested PSUs (in shares)                 0 575,734 452,584