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Stockholders' Equity - Shares Repurchased (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Twelfth Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Repurchased shares to pay withholding taxes (in shares)	841,088	0	841,088	155,778
Shares Related to Withholding Taxes on the Vesting of Restricted Stock
Equity, Class of Treasury Stock [Line Items]
Repurchased shares to pay withholding taxes (in shares)	220	378	26,023	28,306
Withholding taxes average price per share (in usd per share)	$ 23.91	$ 19.84	$ 29.29	$ 21.54

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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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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Total cost of shares repurchased divided by the total number of shares repurchased.

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-SubTopic 30
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