Stockholders' Equity - Schedule of Common Stock (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares issued beginning balance (In shares)	69,991,145	70,573,887	70,596,559	69,818,392
Repurchase of common stock (in shares)	(307,046)	(300,900)	(1,482,655)	(895,699)
Awards effectively repurchased for required employee withholding taxes (in shares)	(71,765)	(90,264)	(254,676)	(294,530)
Shares issued ending balance (In shares)	69,834,253	70,508,389	69,834,253	70,508,389
Issuance of common stock from vested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Issuance of common stock from vested restricted stock units (in shares)	198,478	255,268	699,188	1,255,409
Issuance of common stock from exercise of stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Issuance of common stock from exercise of stock options (in shares)	23,441	70,398	163,214	540,292
Issuance of common stock for employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)	0	0	112,623	84,525