Shareholders Equity (Schedule Of Changes In Non-Vested Restricted Shares) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested shares at beginning of period, Number of Shares	743,869
Non-vested shares at beginning of period, Weighted Average Grant Price	$ 26.54
Shares granted, Number of Shares	225,521
Shares granted, Weighted Average Grant Price	$ 42.25
Shares vested, net of shares repurchased to cover tax withholding requirements,, Number of Shares	(247,128)
Shares vested, net of shares repurchased to cover tax withholding requirements, , Weighted Average Grant Price	$ 23.30
Shares forfeited, Number of Shares	(7,129)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 32.81
Non-vested shares at end of period, Number of Shares	715,133
Non-vested shares at end of period, Weighted Average Grant Price	$ 32.55