Shareholders Equity (Schedule Of Changes In Non-Vested Restricted Shares) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Shareholders' Equity
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	200,391
Shares granted, Weighted Average Grant Price	$ 42.38
Shares vested, net of shares repurchased to cover tax withholding requirements,, Number of Shares	(218,405)
Shares vested, net of shares repurchased to cover tax withholding requirements, , Weighted Average Grant Price	$ 21.62
Shares forfeited, Number of Shares	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 0
Non-vested shares at end of period, Number of Shares	725,855
Non-vested shares at end of period, Weighted Average Grant Price	$ 32.4