Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income Per Share
Net income attributable to shareholders	$ 903,505	$ 1,426,884	$ 1,108,197
Weighted-average shares outstanding - basic	56,359	64,838	72,472
Net effect of various dilutive stock-based compensation awards	676	615	913
Weighted-average shares outstanding - diluted	57,035	65,453	73,385
Net income per share:
Basic	$ 16.03	$ 22.01	$ 15.29
Diluted	$ 15.84	$ 21.80	$ 15.10
Equity awards excluded from diluted net income per share as their effect would have been anti-dilutive	32	53	0