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Earnings Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		5 Months Ended
	Feb. 25, 2021	Dec. 31, 2020	Mar. 31, 2021	Feb. 25, 2021	Mar. 31, 2021	Nov. 30, 2020	Oct. 18, 2020
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount							$ 500,000
Treasury stock acquired, shares					6,100,000
Treasury stock acquired, value			$ 2,998
Treasury stock acquired, average price per common share					$ 27.63
Treasury stock, shares		6,516,525	6,916,584		6,916,584
Treasury stock, carrying value		$ 151,600	$ 164,300		$ 164,300
Open Market
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired, shares					2,000,000.0
Treasury stock acquired, value					$ 53,000
Accelerated Share Repurchase Agreement
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired, shares	500,000	3,500,000
Accelerated share repurchase agreement, aggregate amount						$ 115,000
Accelerated share repurchases, price paid per share				$ 28.45

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- Definition

Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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