Stockholder's Equity (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Nonvested Stock Activity

The following table represents the share grants activity for the three months ended March 31, 2019:

	Restricted stock				Options
	Number of shares		Weighted average grant date fair value		Number of shares		Weighted average grant date fair value
Share grants outstanding as of December 31, 2018	574,285		$	49.68	161,807		$	38.08
Granted	146,830		$	108.93	—		$	—
Vested or exercised	(174,562	)	$	42.29	(44,387	)	$	34.87
Share grants outstanding as of March 31, 2019	546,553		$	67.16	117,420		$	39.73

Shares of Common Stock Issued Under Employee Stock Purchase Plan

The table below details the shares of common stock issued during 2019:

	Number of shares	Per share price
Shares available as of December 31, 2018	152,344
Shares issued during the three months ended March 31, 2019	5,357	$	89.19
Shares available as of March 31, 2019	146,987