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Earnings per Share Repurchase of Common Stock (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2015
Stock Repurchased and Retired During Period, Value	$ 2,070,000	$ 18,830,000	$ 9,060,000	$ 3,950,000	$ 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	76,167			129,866			1,004,154	570,084
Stock Repurchased and Retired During Period, Value	$ 2,100,000			$ 4,000,000			$ 30,000,000	$ 18,200,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 112,700,000						$ 112,700,000

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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