Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 618,720	$ 550,559	$ 538,320
Weighted average common shares outstanding — basic (in shares)	112,910	112,666	112,443
Net effect of dilutive securities:
Contingently issuable performance shares and restricted stock units (in shares)	282	276	315
Weighted average common shares outstanding — diluted (in shares)	113,192	112,942	112,758
Earnings per weighted-average common share outstanding
Net income attributable to common shareholders - basic (in dollars per share)	$ 5.48	$ 4.89	$ 4.79
Net Income attributable to common shareholders - diluted (in dollars per share)	$ 5.47	$ 4.87	$ 4.77