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Share Repurchase Program Share Repurchse Program (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Nov. 02, 2021	Apr. 24, 2019
Treasury Stock Acquired, Average Cost Per Share	$ 41.23
Stock Repurchased During Period, Shares	1,803,000	909,000
Stock Repurchased During Period, Value	$ 62,081,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 250,000,000	$ 200,000,000
Stock Repurchase Program, Authorized Amount	$ 49,509,000
Shares Paid for Tax Withholding for Share Based Compensation	305,735
Stock Repurchased During Period, Shares	1,803,000	909,000
Share Price		$ 43.83
Stock Repurchased During Period, Value	$ 62,081,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 250,000,000	$ 200,000,000
Treasury Stock Acquired, Average Cost Per Share	$ 41.23
Payments Related to Tax Withholding for Share-based Compensation	$ 12,604,000
Common Stock
Treasury Stock Acquired, Average Cost Per Share	$ 41.45
Stock Repurchased During Period, Shares	1,497,609
Stock Repurchased During Period, Shares	1,497,609
Treasury Stock Acquired, Average Cost Per Share	$ 41.45

X

- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Price of a single share of a number of saleable stocks of a company.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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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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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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

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