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Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net income (loss) $ 107,947 $ 128,162 $ 189,365 $ 226,033
Income attributable to unvested participating securities, basic EPS (477) (525) (811) (945)
Net income used in calculating basic EPS $ 107,470 $ 127,637 $ 188,554 $ 225,088
Weighted-average vested shares 38,386 39,531 38,801 39,493
Basic EPS $ 2.80 $ 3.23 $ 4.86 $ 5.70
Income attributable to unvested participating securities, diluted EPS $ (476) $ (524) $ (809) $ (942)
Net income used in calculating diluted EPS $ 107,471 $ 127,638 $ 188,556 $ 225,091
Dilutive effect of incremental shares to be issued for contingently-issuable shares 115 122 113 123
Weighted-average shares used in calculating diluted EPS 38,501 39,653 38,914 39,616
Diluted EPS $ 2.79 $ 3.22 $ 4.85 $ 5.68