Stock-Based Compensation Plan (Summary Of Stock Option Plan Activity) (Details) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Stock Options Activity [Roll Forward]
Options outstanding at beginning of period (in shares)	1,420,749	1,263,485
Options outstanding at end of period (in shares)	1,200,755	1,426,485
Options exercisable at end of period (in shares)	885,855	1,134,635
Weighted Average Exercise Price [Roll Forward]
Options outstanding at beginning of period (in dollars per share)	$ 15.67	$ 14.84
Options outstanding at end of period (in dollars per share)	17.90	15.67
Options exercisable at end of period (in dollars per share)	$ 16.45	$ 13.97
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining term (in years)	5 years 3 months 18 days	5 years
Employees [Member]
Stock Options Activity [Roll Forward]
Options granted - employees and directors (in shares)	127,000	120,000
Options forfeited - employees (in shares)		(5,417)
Options exercised - employees (in shares)	(396,994)	(1,583)
Weighted Average Exercise Price [Roll Forward]
Options granted - employees and directors (in dollars per share)	$ 21.89	$ 22.09
Options forfeited - employees (in dollars per share)		22.55
Options exercised - employees (in dollars per share)	$ 11.70	$ 17.77
Directors [Member]
Stock Options Activity [Roll Forward]
Options granted - employees and directors (in shares)	50,000	50,000
Weighted Average Exercise Price [Roll Forward]
Options granted - employees and directors (in dollars per share)	$ 21.89	$ 22.09