Stock-Based Compensation (Summary Of Status Of Company's Equity Compensations Plans) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares [Roll Forward]
Granted (in shares)		45,000	215,000
Exercised (in shares)	(132,960)	(113,334)	(605,494)
Weighted-average remaining contractual term [Abstract]
Outstanding, beginning of period	5 years 5 months 19 days	5 years 4 months 21 days
Outstanding, end of period	5 years 5 months 19 days	5 years 4 months 21 days
Exercisable, end of period	5 years 3 months 15 days
Aggregate intrinsic value [Abstract]
Exercised	$ 455,000	$ 1,500,000	$ 3,000,000
Equity Compensations Plans [Member]
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	2,602,000
Exercised (in shares)	(83,500)
Expired (in shares)	(457,250)
Forfeited (in shares)	(83,750)
Outstanding, end of period (in shares)	1,977,500	2,602,000
Exercisable, end of period (in shares)	1,758,125
Weighted average exercise price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 9.72
Exercised (in dollars per share)	7.66
Expired (in dollars per share)	15.08
Forfeited (in dollars per share)	9.20
Outstanding, end of period (in dollars per share)	8.58	$ 9.72
Exercisable, end of period (in dollars per share)	$ 8.48