Earnings Per Common Share (Schedule of Basic and Diluted 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, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 202,820	$ 154,244	$ 194,451
Earnings allocated to participating securities - nonvested restricted shares	330	712	1,530
Basic earnings allocated to common shareholders	$ 202,490	$ 153,532	$ 192,921
Weighted average common shares outstanding	72,683	70,835	71,999
Basic earnings per common share	$ 2.79	$ 2.17	$ 2.68
Weighted average number of common shares outstanding	72,683	70,835	71,999
Earnings allocated to common shareholders, Diluted	$ 202,490	$ 153,532	$ 192,921
Dilutive effect of equity awards and warrants	190	45	33
Weighted average diluted common shares outstanding	72,873	70,880	72,032
Diluted earnings per common share	$ 2.78	$ 2.17	$ 2.68
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	212	289	8