Stock-Based Compensation (Summary Of Status Of Company's Equity Compensations Plans) (Details) - Stock Options [Member] - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Shares [Roll Forward]
Options Granted (in shares)	0	65,104
Exercised (in shares)	(74,000)	0
Aggregate intrinsic value [Abstract]
Exercised	$ 5,300,000
Equity Compensations Plans [Member]
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	1,311,604
Expired (in shares)	(74,000)
Forfeited (in shares)	(8,000)
Outstanding, end of period (in shares)	1,229,604		1,311,604
Exercisable, end of period (in shares)	1,105,776
Weighted average exercise price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 8.24
Expired (in dollars per share)	8.38
Forfeited (in dollars per share)	9.39
Outstanding, end of period (in dollars per share)	8.22		$ 8.24
Exercisable, end of period (in dollars per share)	$ 8.31
Weighted-average remaining contractual term [Abstract]
Outstanding	2 years 11 months 12 days		3 years 1 month 10 days
Exercisable, end of period	2 years 5 months 19 days
Aggregate intrinsic value [Abstract]
Outstanding, beginning of period	$ 6,203,523
Granted
Exercised
Expired
Forfeited
Outstanding, end of period			$ 6,203,523
Exercisable, end of period