Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Number of shares outstanding, beginning of period (in shares)	9,441	12,939	19,219
Number of shares, granted (in shares)	0	0	0
Number of shares, exercised (in shares)	(2,671)	(2,956)	(4,205)
Number of shares, forfeited/canceled (in shares)	(39)	(542)	(2,075)
Number of shares outstanding, end of period (in shares)	6,731	9,441	12,939	19,219
Number of shares exercisable (in shares)	5,851
Weighted Average Exercise Price
Weighted average exercise price, outstanding, beginning of period (in USD per share)	$ 8.56	$ 8.38	$ 7.78
Weighted average exercise price, granted (in USD per share)	0	0	0
Weighted average exercise price, exercised (in USD per share)	6.84	7.34	4.53
Weighted average exercise price, forfeited/canceled (in USD per share)	14.96	10.80	10.63
Weighted average exercise price, outstanding, end of period (in USD per share)	9.21	$ 8.56	$ 8.38	$ 7.78
Weighted average exercise price, exercisable (in USD per share)	$ 8.30
Weighted Average Remaining Contractual Term/ Aggregate Intrinsic Value
Weighted average remaining contractual term (in years), outstanding	5 years 6 months	6 years 4 months 24 days	7 years 1 month 6 days	8 years
Weighted average remaining contractual term (in years), exercisable	5 years 4 months 24 days
Aggregate intrinsic value, outstanding, beginning of period	$ 412,547	$ 201,608	$ 277,114
Aggregate intrinsic value, exercised	111,256	73,277	98,378
Aggregate intrinsic value, outstanding, end of period	308,677	$ 412,547	$ 201,608	$ 277,114
Aggregate intrinsic value, exercisable	$ 273,642