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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Earnings Per Share, Basic [Abstract]                      
Net income                 $ 121,173 $ 274,773 $ 366,284
Non-forfeitable dividends on unvested restricted shares                 (410) (649) (331)
Net income attributable to the Company’s common stockholders for basic earnings per share                 $ 120,763 $ 274,124 $ 365,953
Weighted average shares outstanding – basic                 296,972 298,229 302,074
Net income per share (usd per share) $ 0.08 $ 0.09 $ 0.03 $ 0.20 $ 0.21 $ 0.27 $ 0.23 $ 0.21 $ 0.41 $ 0.92 $ 1.21
Computation of Diluted Earnings Per Share:                      
Net income attributable to the Company’s common stockholders for diluted earnings per share                 $ 120,763 $ 274,124 $ 365,953
Equity awards (in shares)                 927 1,105 265
Weighted average shares outstanding - diluted (in shares)                 297,899 299,334 302,339
Net income per share (usd per share) $ 0.08 $ 0.09 $ 0.03 $ 0.20 $ 0.21 $ 0.27 $ 0.23 $ 0.21 $ 0.41 $ 0.92 $ 1.21