Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Stock-based Compensation

Summary of stock option activity

				Remaining	Aggregate
		Exercise		Contractual Term	Intrinsic Value
	Shares	Price		(in years)	(in thousands)(1)
Balance at December 31, 2019	364,153	$	22.90	0.75	$	8,965
Granted	—	$	—	—	$	—
Exercised	(101,200)	$	20.00	—	$	1,460
Forfeited/canceled	—	$	—	—	$	—
Balance at March 31, 2020	262,953	$	24.02	0.62	$	306
Vested and exercisable as of March 31, 2020	262,953	$	24.02	0.62	$	306

(1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of our Class A common stock as of the respective date.

Summary of additional information regarding exercisable and vested stock options

	Stock Options Exercisable
	and Vested
		Weighted-
		Average
	Number of	Remaining Life
Range of exercise prices	Shares	(in years)
$20.00	142,953	0.24
$28.80	120,000	1.07
$20.00 - $28.80	262,953	0.62

Summary of activities for unvested RSUs

	Unvested Restricted Stock Units
		Weighted-Average
	Number of	Grant-Date
	Shares	Fair Value
Unvested at December 31, 2019	1,254,904	$	43.62
Granted	527,246	$	45.85
Vested	(379,778)	$	47.54
Forfeited/canceled	—	$	—
Unvested at March 31, 2020	1,402,372	$	43.40
Expected to vest after March 31, 2020	1,499,715	$	43.26