Stock-Based Compensation - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Number of Shares
Number of shares outstanding, beginning of period (in shares) | shares	12,939
Number of shares, granted (in shares) | shares	0
Number of shares, exercised (in shares) | shares	(1,594)
Number of shares, forfeited/canceled (in shares) | shares	(287)
Number of shares outstanding, end of period (in shares) | shares	11,058	12,939
Number of shares exercisable (in shares) | shares	6,692
Weighted Average Exercise Price
Weighted average exercise price, outstanding, beginning of period (in usd per share) | $ / shares	$ 8.38
Weighted average exercise price, granted (in usd per share) | $ / shares	0
Weighted average exercise price, exercised (in usd per share) | $ / shares	6.89
Weighted average exercise price, forfeited/canceled (in usd per share) | $ / shares	10.99
Weighted average exercise price, outstanding, end of period (in usd per share) | $ / shares	8.53	$ 8.38
Weighted average exercise price, exercisable (in usd per share) | $ / shares	$ 6.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term (in years), outstanding	6 years 9 months 18 days	7 years 1 month 6 days
Weighted average remaining contractual term (in years), exercisable	6 years 4 months 24 days
Aggregate intrinsic value, outstanding | $	$ 235,370	$ 201,608
Aggregate intrinsic value, exercised | $	33,416
Aggregate intrinsic value, exercisable | $	$ 156,517