Stock-Based Compensation Plan (Summary Of Stock Option Plan Activity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock Options Activity [Roll Forward]
Options outstanding at beginning of period (in shares)	1,263,485	1,335,680
Options outstanding at end of period (in shares)	1,256,485	1,246,185
Options exercisable at end of period (in shares)	1,065,373	981,310
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 14.84	$ 13.41
Outstanding at end of period (in dollars per share)	$ 14.80	$ 13.48
Exercisable at end of period (in dollars per share)	$ 13.23	$ 11.99
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining term of the stock options exercisable (in years)	5 years	5 years 8 months 12 days
Employees [Member]
Stock Options Activity [Roll Forward]
Options forfeited - employees (in shares)	(5,417)	(834)
Options exercised - employees (in shares)	(1,583)	(88,661)
Weighted Average Exercise Price [Roll Forward]
Forfeited - employees (in dollars per share)	$ 22.55	$ 5.60
Options exercised - employees (in dollars per share)	$ 17.77	$ 12.50