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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								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 114,062	$ 103,858	$ 87,287	$ 88,761	$ (1,988)	$ 66,536	$ 52,811	$ 65,512	$ 393,968	$ 182,871	$ 81,520
Preferred dividends	2,344	2,343	2,344	2,344	2,344	2,343	2,344	2,344	9,375	9,375	3,906
Net Income available to common shareholders	$ 111,718	$ 101,515	$ 84,943	$ 86,417	$ (4,332)	$ 64,193	$ 50,467	$ 63,168	$ 384,593	$ 173,496	$ 77,614
Average shares used in basic computation	71,666	71,919	71,692	71,999	68,782	68,522	68,556	68,386	71,786	68,562	66,871
Dilutive effect of stock options and units									9,535	12,473	10,692
Average shares used in diluted computation	80,706	81,484	81,299	81,789	68,782	80,881	80,021	80,695	81,321	81,035	77,563
Basic	$ 1.56	$ 1.41	$ 1.18	$ 1.20	$ (0.06)	$ 0.94	$ 0.74	$ 0.92	$ 5.36	$ 2.53	$ 1.16
Diluted	$ 1.38	$ 1.25	$ 1.04	$ 1.06	$ (0.06)	$ 0.79	$ 0.63	$ 0.78	$ 4.73	$ 2.14	$ 1.00

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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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