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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income from continuing operations	$ 74,929	$ 37,434	$ 120,782	$ 102,012
Net income/(loss) from discontinued operations	(5,239)	276	(7,037)	(3,393)
Net income	$ 69,690	$ 37,710	$ 113,745	$ 98,619
Average shares used in basic computation	64,706	53,601	63,133	53,471
Dilutive effect of stock options and units	10,485	9,453	9,718	9,346
Average shares used in diluted computation	75,191	63,054	72,851	62,817
Income from continuing operations	$ 1.16	$ 0.70	$ 1.91	$ 1.91
Income from discontinued operations	$ (0.08)		$ (0.11)	$ (0.07)
Earnings per basic common share	$ 1.08	$ 0.70	$ 1.80	$ 1.84
Income from continuing operations	$ 1.00	$ 0.60	$ 1.66	$ 1.62
Income from discontinued operations	$ (0.07)		$ (0.10)	$ (0.05)
Earnings per diluted common share	$ 0.93	$ 0.60	$ 1.56	$ 1.57