Equity Incentive Plans (Summary Of Restricted Share Unit Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Shares, Outstanding at December 31, 2012	322,808
Number of Shares, Granted	198,833
Number of Shares, Vested	(145,570)
Number of Shares, Outstanding at December 31, 2013	371,864
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2012	$ 42.52
Weighted Average Grant Date Fair Value, Granted	$ 47.15
Weighted Average Grant Date Fair Value, Vested	$ 39.88
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2013	$ 46.00
Weighted Average Life Remaining, Outstanding at December 31, 2013	11 months 26 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Shares, Outstanding at December 31, 2012	10,925
Number of Shares, Granted	17,530
Number of Shares, Vested	(10,925)
Number of Shares, Outstanding at December 31, 2013	17,530
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2012	$ 44.62
Weighted Average Grant Date Fair Value, Granted	$ 58.38
Weighted Average Grant Date Fair Value, Vested	$ 44.62
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2013	$ 58.38
Weighted Average Life Remaining, Outstanding at December 31, 2013	4 months 10 days
Unamortized share-based compensation expense	$ 358