Earnings Per Common Share (Summary Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 39,447		$ 21,466		$ 73,630	$ 29,712
Add: net loss attributable to noncontrolling interests	332		207		633	361
Net income attributable to stockholders	39,779		21,673		74,263	30,073
Less: net income attributable to unvested restricted stock awards	(19)		0		(19)	0
Net income attributable to common stockholders - basic	$ 39,760		$ 21,673		$ 74,244	$ 30,073
BASIC:
Weighted average common shares outstanding (in shares)	43,388,753		45,708,238		43,388,748	45,779,433
DILUTED:
Weighted average common shares outstanding (in shares)	43,388,753		45,708,238		43,388,748	45,779,433
Stock options (in shares)	0		10,300		1,344	5,338
Weighed average dilutive common shares outstanding (in shares)	43,388,753		45,718,538		43,390,092	45,784,771
Earnings per common share - basic (in US dollars per share)	$ 0.92		$ 0.47		$ 1.71	$ 0.66
Earnings per common share - diluted (in US dollars per share)	$ 0.92		$ 0.47		$ 1.71	$ 0.66
Incremental anti-dilutive shares excluded:
Net share effect of stock options with an exercise price in excess of the average market price for our common shares (in shares)	903,425		503,862		776,771	488,187
Regular dividends declared per common share (in US dollars per share)	$ 0.90	$ 0.90	$ 0.90	$ 0.90	$ 1.80	$ 1.80