Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Reconciliation between Basic and Diluted Earnings Per Share (Details 1)

v3.10.0.1
Summary of Significant Accounting Policies - Reconciliation between Basic and Diluted Earnings Per Share (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income $ 154,634 $ 470,378 $ 226,676 $ 103,155 $ 98,797 $ 400,692 $ 198,473 $ 61,910 $ 954,843 $ 759,872 $ 633,085
Basic weighted-average shares outstanding                 223,001,739 228,040,825 227,121,875
Dilutive effect of share awards                 1,417,466 1,377,501 728,411
Diluted weighted-average shares outstanding                 224,419,205 229,418,326 227,850,286
Basic earnings per share (in dollars per share) $ 0.7 $ 2.12 $ 1.02 $ 0.45 $ 0.43 $ 1.76 $ 0.87 $ 0.27 $ 4.28 $ 3.33 $ 2.79
Diluted earnings per share (in dollars per share) $ 0.7 $ 2.11 $ 1.01 $ 0.45 $ 0.43 $ 1.74 $ 0.87 $ 0.27 $ 4.25 $ 3.31 $ 2.78