Earnings Per Common Share (Summary Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 111,804	$ 185,126	$ 160,456
BASIC:
Weighted Average Number of Shares Outstanding, Basic	45,714,221	44,696,285	43,417,828
Net income per common share attributable to common stockholders	$ 2.45	$ 4.14	$ 3.70
DILUTED:
Weighted average common shares outstanding, diluted	45,714,221	44,696,285	43,417,828
Stock options, diluted	4,823	1,719	75,196
Convertible subordinated debentures	10,453	0	210,224
Average dilutive common shares outstanding	45,729,497	44,698,004	43,703,248
Net income per common share attributable to common stockholders	$ 2.44	$ 4.14	$ 3.67
Incremental shares excluded since anti-dilutive:
Stock options with an exercise price in excess of the market price for our common shares	383,716	390,596	4,678
Common Stock, Dividends, Per Share, Declared	$ 3.8025	$ 4.41	$ 4.20