Stock-Based Compensation (Summary Of Status Of Company's Equity Compensations Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares [Roll Forward]
Options Granted (in shares)		0	0
Exercised (in shares)	(494,430)	(594,673)	(468,431)
Weighted-average remaining contractual term [Abstract]
Granted	3 years 1 month 17 days
Outstanding	3 years 1 month 10 days	3 years 9 months 7 days
Exercisable, end of period	2 years 6 months 22 days
Equity Compensations Plans [Member]
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	1,276,500
Options Granted (in shares)	65,104
Exercised (in shares)	(30,000)
Outstanding, end of period (in shares)	1,311,604	1,276,500
Exercisable, end of period (in shares)	1,171,500
Weighted average exercise price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 8.23
Granted (in dollars per share)	8.57
Exercised (in dollars per share)	8.59
Outstanding, end of period (in dollars per share)	8.24	$ 8.23
Exercisable, end of period (in dollars per share)	$ 8.32
Aggregate intrinsic value [Abstract]
Outstanding, beginning of period	$ 511,200
Granted	286,458
Exercised	75,975
Outstanding, end of period	6,203,523	$ 511,200
Exercisable, end of period	$ 5,450,565