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Stockholders' Equity - Schedule of Common Stock (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued beginning balance (In shares)	67,292,864	69,991,145	69,065,491	70,596,559
Repurchase of common stock (in shares)	(521,137)	(307,046)	(2,688,538)	(1,482,655)
Awards effectively repurchased for required employee withholding taxes (in shares)	(56,859)	(71,765)	(175,476)	(254,676)
Shares issued ending balance (In shares)	66,897,984	69,834,253	66,897,984	69,834,253
Issuance of common stock from vested restricted stock units ¹
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vested restricted stock units (in shares)	158,041	198,478	500,291	699,188
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)	25,075	23,441	65,684	163,214
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	130,532	112,623

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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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