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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share ) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 87,287	$ 52,811	$ 176,048	$ 118,323
Preferred dividends	2,344	2,344	4,688	4,688
Net income available to common shareholders	$ 84,943	$ 50,467	$ 171,360	$ 113,635
Average shares used in basic computation	71,692	68,556	71,843	68,471
Dilutive effect of stock options and units	9,607	11,465	9,705	11,920
Average shares used in diluted computation	81,299	80,021	81,548	80,391
Basic	$ 1.18	$ 0.74	$ 2.39	$ 1.66
Diluted	$ 1.04	$ 0.63	$ 2.10	$ 1.41

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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