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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net income $ 400,692 $ 342,378 $ 661,075 $ 560,853
Basic weighted-average shares outstanding (in shares) 228,267,307 227,096,142 227,891,916 227,102,560
Dilutive effect of share awards 1,549,649 502,465 1,265,341 757,057
Diluted weighted-average shares outstanding (in shares) 229,816,956 227,598,607 229,157,257 227,859,617
Basic earnings per share (in dollars per share) $ 1.76 $ 1.51 $ 2.90 $ 2.47
Diluted earnings per share (in dollars per share) $ 1.74 $ 1.50 $ 2.88 $ 2.46