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Stockholders' Equity - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 06, 2019
Additional Disclosures for equity-based plans
Shares available for grant (in shares)	12,000,000
Issuance of common stock under ESPP (in shares)	175,966	224,928	283,644
Outstanding common stock authorized to be repuchased	$ 0	$ 120,000,000	$ 100,000,000
Remaining authorized amount of outstanding common stock available for repuchase	$ 75,000,000
Number of shares repurchased (in shares)	1,190,995	1,549,434	3,414,675
Stock Options
Additional Disclosures for equity-based plans
Vesting period	4 years
Stock Options | Nonemployee directors | Maximum
Additional Disclosures for equity-based plans
Contractual term	10 years
Time-Based RSUs and RSAs
Additional Disclosures for equity-based plans
Vesting period	4 years
Time-Based RSUs and RSAs | Minimum
Additional Disclosures for equity-based plans
Percent of share value	0.00%
Time-Based RSUs and RSAs | Maximum
Additional Disclosures for equity-based plans
Percent of share value	200.00%
Performance-Based RSUs and RSAs | 2018
Additional Disclosures for equity-based plans
Vesting period	1 year
Amount of shares that are expected to vest( as a percent )	50.00%
ESPP
Additional Disclosures for equity-based plans
Shares available for grant (in shares)	3,000,000
Employee Stock Purchase Plan
Additional Disclosures for equity-based plans
Stock options granted percentage of fair market value on offering date	85.00%
Stock options granted percentage of fair market value on purchase date	85.00%
Employee Stock Purchase Plan | Minimum
Additional Disclosures for equity-based plans
Employee earnings contribution percentage	1.00%
Employee Stock Purchase Plan | Maximum
Additional Disclosures for equity-based plans
Employee earnings contribution percentage	15.00%
Subsequent Event
Additional Disclosures for equity-based plans
Outstanding common stock authorized to be repuchased				$ 300,000,000

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