Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Reconciliation between Basic and Diluted Earnings Per Share (Details)

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Summary of Significant Accounting Policies - Reconciliation between Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 470,378 $ 400,692 $ 800,209 $ 661,075
Basic weighted-average shares outstanding (in shares) 221,511,630 228,267,307 224,033,156 227,891,916
Dilutive effect of share awards 1,241,108 1,549,649 1,389,229 1,265,341
Diluted weighted-average shares outstanding (in shares) 222,752,738 229,816,956 225,422,385 229,157,257
Basic earnings per share (in dollars per share) $ 2.12 $ 1.76 $ 3.57 $ 2.90
Diluted earnings per share (in dollars per share) $ 2.11 $ 1.74 $ 3.55 $ 2.88