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Earnings per Share Repurchase of Common Stock (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2015
Stock Repurchased and Retired During Period, Value	$ 18,830,000	$ 9,060,000	$ 11,570,000	$ 2,640,000
10b5-1 share repurchase program [Member]
Stock Repurchase Program, Authorized Amount	$ 250,000,000				$ 250,000,000		$ 50,000,000
Stock Repurchased and Retired During Period, Shares	645,984		358,047		927,987	440,218
Stock Repurchased and Retired During Period, Value	$ 18,800,000		$ 11,600,000		$ 27,900,000	$ 14,200,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 114,700,000				$ 114,700,000

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Number of shares that have been repurchased and retired during the period.

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