Shareholders Equity (Schedule Of Changes In Non-Vested Restricted Shares) (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
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 | shares	668,109
Shares granted, Number of Shares | shares	313,498
Shares vested, Number of Shares | shares	(233,831)
Shares forfeited, Number of Shares | shares	(6,983)
Non-vested shares at end of period, Number of Shares | shares	740,793
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested shares at beginning of period, Weighted Average Grant Price	$ 33.51
Shares granted, Weighted Average Grant Price	56.19
Shares vested, Weighted Average Grant Price	28.19
Shares forfeited, Weighted Average Grant Price	39.88
Non-vested shares at end of period, Weighted Average Grant Price	$ 44.73