Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share ) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Earnings Per Share [Abstract]
Income from continuing operations	$ 45,577		$ 30,916		$ 93,550		$ 45,852
Loss from discontinued operations	(1,976)		(1,481)		(2,567)		(1,798)
Net income	$ 43,601		$ 29,435		$ 90,983		$ 44,054
Average shares used in basic computation	66,302		64,505		66,167		62,292
Dilutive effect of stock options and units	9,339		9,585		9,498		9,335
Average shares used in diluted computation	75,641		74,090		75,665		71,627
Income from continuing operations	$ 0.69		$ 0.48		$ 1.42		$ 0.74
Loss from discontinued operations	$ (0.03)		$ (0.02)		$ (0.04)		$ (0.03)
Earnings per basic common share	$ 0.66		$ 0.46		$ 1.38		$ 0.71
Income from continuing operations	$ 0.60		$ 0.42		$ 1.24		$ 0.64
Loss from discontinued operations	$ (0.02)		$ (0.02)		$ (0.04)		$ (0.02)
Earnings per diluted common share	$ 0.58	[1]	$ 0.40	[1]	$ 1.20	[1]	$ 0.62	[1]

[1] Diluted earnings per share is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units.