Stock-Based Compensation Plan (Summary Of Stock Option Plan Activity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 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)	1,066,505	1,256,485
Options exercisable at end of period (in shares)	835,276	1,065,373
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)	$ 16.78	$ 14.80
Options exercisable at end of period (in dollars per share)	$ 15.31	$ 13.23
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining term (in years)	5 years 1 month 6 days	5 years
Employees [Member]
Stock Options Activity [Roll Forward]
Options forfeited - employees (in shares)		(5,417)
Options exercised - employees (in shares)	(354,244)	(1,583)
Weighted Average Exercise Price [Roll Forward]
Options forfeited - employees (in dollars per share)		$ 22.55
Options exercised - employees (in dollars per share)	$ 12.35	$ 17.77