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Summary of Significant Accounting Policies - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]                      
Net income $ 76,519 $ 115,506 $ 92,593 $ 113,896 $ 73,452 $ 106,053 $ 73,922 $ 90,828 $ 398,514 $ 344,255 $ 399,630
Net income attributable to unvested awarded performance stock                 (12,873) (8,297) (9,746)
Net income attributable to common shares                 $ 385,641 $ 335,958 $ 389,884
Weighted average number of common shares outstanding – basic                 281,566 277,663 279,394
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic                 (9,095) (6,692) (6,814)
Weighted average number of common shares outstanding for basic earnings per common share                 272,471 270,971 272,580
Dilutive effect of stock options                 2,145 4,550 5,006
Weighted average number of shares outstanding – diluted                 274,616 275,521 277,586
Net income per share:                      
Basic (in dollars per share) $ 0.27 $ 0.41 $ 0.33 $ 0.41 $ 0.26 $ 0.38 $ 0.27 $ 0.33 $ 1.42 $ 1.24 $ 1.43
Diluted (in dollars per share) $ 0.27 $ 0.41 $ 0.33 $ 0.40 $ 0.26 $ 0.38 $ 0.26 $ 0.32 $ 1.40 $ 1.22 $ 1.40