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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

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, 2016		3,308,158	​	$	20.40		3.50		46,086
Granted		—	​	​	—		—	​	—
Exercised		(450,000)	​	$	20.59		—		9,397
Forfeited/canceled		—	​	​	—		—		—
Balance at December 31, 2017		2,858,158	​	$	20.37		2.49		79,230
Granted		—	​	​	—		—	​	—
Exercised		(237,863)	​	$	20.00		—		5,505
Forfeited/canceled		—	​	​	—		—		—
Balance at December 31, 2018		2,620,295	​	$	20.40		1.49		25,697
Granted		—	​	​	—		—	​	—
Exercised		(2,256,142)	​	$	20.00		—		46,358
Forfeited/canceled		—	​	​	—		—		—
Balance at December 31, 2019		364,153	​	$	22.90		0.75		8,965
Vested and exercisable as of December 31, 2019		364,153	​	$	22.90		0.75		8,965

(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

​

​	​	​	​	​	​	​	​	​
​	​	​	​	​		Options Exercisable
​	​	Options Outstanding			​	and Vested
​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​
​		​		Weighted-		​		Weighted-
​	​	​	​	Average	​	​	​	Average
​	​	Number of	​	Remaining Life	​	Number of	​	Remaining Life
Range of exercise prices	​	Shares		(in years)		Shares		(in years)
$20.00		244,153		0.47	​	244,153	​	0.47
$28.80		120,000		1.32	​	120,000		1.32
$20.00 - $28.80		364,153		0.75	​	364,153		0.75

Summary of activities for unvested RSUs

​

​	​	​	​	​	​
​		Unvested Restricted Stock Units
​	​	​	​	Weighted‑
​	​	​	​	Average
​	​	Number of	​	Grant‑Date
​		Shares		Fair Value
Unvested at December 31, 2018		1,055,325		$	41.66
Granted		674,269	​	$	39.68
Vested		(271,037)	​	$	34.58
Forfeited/canceled		(203,654)	​	$	32.44
Unvested at December 31, 2019		1,254,903	​	$	43.62
Expected to vest after December 31, 2019		1,344,445	​	$	43.46

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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