Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of costs related to company's stock-based compensation plan

The following costs related to the Company’s stock-based compensation plans are included in the unaudited consolidated statements of income:

	Three months ended March 31,
	2019		2018
Cost of revenues	$	1,326	$	1,093
General and administrative expenses	2,975		2,250
Selling and marketing expenses	2,655		1,731
Total	$	6,956	$	5,074

Schedule of stock options activity

Stock option activity under the Company’s stock-based compensation plans is shown below:

	Number of Options		Weighted-Average Exercise Price		Aggregate Intrinsic Value		Weighted-Average Remaining Contractual Life (Years)
Outstanding at December 31, 2018	162,475		$	20.21	$	5,267	2.24
Granted	—		—		—		—
Exercised	(2,500	)	8.75		131		—
Forfeited	—		—		—		—
Outstanding at March 31, 2019	159,975		$	20.39	$	6,341	2.03
Vested and exercisable at March 31, 2019	159,975		$	20.39	$	6,341	2.03

Schedule of restricted stock and RSU activity

Restricted stock and restricted stock unit activity under the Company’s stock-based compensation plans is shown below:

	Restricted Stock				Restricted Stock Units
	Number		Weighted Average Fair Value		Number		Weighted Average Fair Value
Outstanding at December 31, 2018*	103,623		$	42.68	953,578		$	51.81
Granted	—		—		449,523		64.26
Vested	(48,854	)	35.91		(354,138	)	46.01
Forfeited	—		—		(21,623	)	55.19
Outstanding at March 31, 2019*	54,769		$	48.72	1,027,340		$	59.19

* As of March 31, 2019 and December 31, 2018 restricted stock units vested for which the underlying common stock is yet to be issued are 155,753 and 155,753, respectively.

Schedule of performance based stock awards activity

Performance based restricted stock unit (the “PRSUs”) activity under the Company’s stock-based compensation plans is shown below:

	Revenue Based PRSUs			Market Condition Based PRSUs
	Number	Weighted Average Fair Value		Number	Weighted Average Fair Value
Outstanding at December 31, 2018	100,353	$	54.07	100,336	$	62.43
Granted	54,062	64.33		54,053	92.13
Vested	—	—		—	—
Forfeited	—	—		—	—
Outstanding at March 31, 2019	154,415	$	57.66	154,389	$	72.83