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Earnings and Dividends per Share (Reconciliation Of Denominator For Basic And Diluted Earnings (Loss) Per Share) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings and Dividends Per Share [Abstract]
Weighted average common shares—basic									127,850,592	128,395,184	129,401,823
Weighted Average Number Diluted Shares Outstanding Adjustment									238,466	362,109	583,930
Weighted average common shares—diluted									128,089,058	128,757,293	129,985,753
Basic (in dollars per share)	$ 0.87	$ 0.45	$ 0.11	$ 1.13	$ 0.56	$ 1.22	$ 0.92	$ 0.56	$ 2.57	$ 3.26	$ 7.66
Diluted (in dollars per share)	$ 0.87	$ 0.45	$ 0.11	$ 1.13	$ 0.56	$ 1.22	$ 0.92	$ 0.55	$ 2.56	$ 3.25	$ 7.62

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Earnings and Dividends Per Share [Abstract]

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