Shareholders Equity (Schedule Of Changes In Non-Vested Restricted Shares) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Shareholders' Equity
Non-vested shares at beginning of period, Number of Shares	828,686	732,412	664,909
Shares granted, Number of Shares	291,863	281,429	276,869
Shares vested, Number of Shares	(360,337)	(183,019)	(208,949)
Shares forfeited, Number of Shares	(16,343)	(2,136)	(417)
Non-vested shares at end of period, Number of Shares	743,869	828,686	732,412
Non-vested shares at beginning of period, Weighted Average Grant Price	$ 22.50	$ 21.91	$ 22.16
Shares granted, Weighted Average Grant Price	$ 31.66	$ 26.78	$ 21.78
Shares vested, Weighted Average Grant Price	$ 21.55	$ 25.98	$ 23.11
Shares forfeited, Weighted Average Grant Price	$ 23.11	$ 26.26	$ 24.75
Non-vested shares at end of period, Weighted Average Grant Price	$ 26.54	$ 22.50	$ 21.91