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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net income $ 342,378 $ 251,787 $ 560,853 $ 388,825
Basic weighted-average shares outstanding 227,096,142 227,384,616 227,102,560 225,805,901
Dilutive effect of share awards 502,465 2,890,140 757,057 4,054,999
Diluted weighted-average shares outstanding 227,598,607 230,274,756 227,859,617 229,860,900
Basic earnings per share (in dollars per share) $ 1.51 $ 1.11 $ 2.47 $ 1.72
Diluted earnings per share (in dollars per share) $ 1.50 $ 1.09 $ 2.46 $ 1.69