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Stockholders' Equity (Narrative) (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 31, 2021
Equity, Class of Treasury Stock [Line Items]
Preferred stock	$ 0		$ 92,000,000
Common stock	59,885,000		59,885,000
Legal surplus	114,500,000		103,300,000
Stock Repurchase Program Remaining Authorized Repurchase Amount	$ 9,900,000
Stock repurchase program remaining number of shares authorized to be repurchased	390,652
Stock Repurchase Program Authorized Amount	$ 50,000,000			$ 50,000,000.0
Share price	$ 25.22
Shares repurchased during period, shares	1,684,921	175,000
Common shares repurchased as part of the stock repurchase program (Value)	$ 40,161,000	$ 2,226,000
Share repurchased, average price per share	$ 23.83	$ 12.69
Preferred Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Preferred Stock Issue Costs			10,100,000
Preferred stock, redemption price per share				$ 25.00
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Common Stock Issuance Cost	$ 13,600,000		$ 13,600,000

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