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Stockholders' Equity - Schedule of Common Stock (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued beginning balance (in shares)	65,864,116	67,292,864	66,456,663	69,065,491
Repurchase of common stock (in shares)	(230,456)	(521,137)	(1,155,707)	(2,688,538)
Awards effectively repurchased for required employee withholding taxes (in shares)	(47,764)	(56,859)	(165,383)	(175,476)
Shares issued ending balance (in shares)	65,743,170	66,897,984	65,743,170	66,897,984
Issuance of common stock from vested restricted stock units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vested restricted stock units (in shares)	127,704	158,041	474,222	500,291
Issuance of common stock from exercise of stock options
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options (in shares)	29,570	25,075	59,305	65,684
Issuance of common stock for employee stock purchase plan
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)	0	0	74,070	130,532

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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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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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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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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