Net Income per Common 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]
Numerator for basic and dilutive net income per common share – net income allocable to common shareholders	$ 1,732,444	$ 1,098,335	$ 1,272,767
Denominator for basic net income per share - weighted average common shares outstanding	174,858	174,494	174,287
Net effect of dilutive stock options - based on treasury stock method	710	148	243
Denominator for dilutive net income per share - weighted average common shares outstanding	175,568	174,642	174,530
Basic (in USD per share)	$ 9.91	$ 6.29	$ 7.30
Diluted (in USD per share)	$ 9.87	$ 6.29	$ 7.29