Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ 81,419	$ 97,872
Income attributable to unvested participating securities, basic EPS	(337)	(417)
Net income used in calculating basic EPS	$ 81,082	$ 97,455
Weighted-average vested shares	39,221	39,456
Basic EPS	$ 2.07	$ 2.47
Income attributable to unvested participating securities, diluted EPS	$ (337)	$ (416)
Net income used in calculating diluted EPS	$ 81,082	$ 97,456
Dilutive effect of incremental shares to be issued for contingently-issuable shares	111	125
Weighted-average shares used in calculating diluted EPS	39,332	39,581
Diluted EPS	$ 2.06	$ 2.46