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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income $ 103,155 $ 61,910
Basic weighted-average shares outstanding (in shares) 227,343,577 227,468,526
Dilutive effect of share awards 1,844,051 1,087,426
Diluted weighted-average shares outstanding (in shares) 229,187,628 228,555,952
Basic earnings per share (in dollars per share) $ 0.45 $ 0.27
Diluted earnings per share (in dollars per share) $ 0.45 $ 0.27