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Stockholders' Equity - Shares Repurchased (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Twelfth Stock Repurchase Plan [Member] [Member] [Domain]
Equity, Class of Treasury Stock [Line Items]
Repurchased shares to pay withholding taxes (in shares)	0	155,778
Eleventh Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Repurchased shares to pay withholding taxes (in shares)	0	639,922
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)	23,246	25,882
Withholding taxes average price per share (in usd per share)	$ 29.54	$ 21.79

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Section S99
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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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