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Stockholders' Equity - Shares Repurchased (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Value			$ 23.25
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
Stock Repurchased During Period, Value			$ 20.34
Eleventh Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Repurchased shares to pay withholding taxes (in shares)		264,712	639,922	292,712
Stock Repurchased During Period, Value		$ 26.23	$ 23.95	$ 26.50
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)	378	405	28,306	28,434
Stock Repurchased During Period, Value	$ 19.84	$ 27.67	$ 21.54	$ 30.83

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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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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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