Stockholder's Equity (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Nonvested Stock Activity

The following table represents the nonvested stock activity for the three months ended March 31, 2017:

	Number of shares		Weighted average grant date fair value
Nonvested shares outstanding as of December 31, 2016	574,711		$	31.61
Granted	151,010		$	48.52
Vested	(170,042	)	$	28.46
Nonvested shares outstanding as of March 31, 2017	555,679		$	37.17

Shares of Common Stock Issued During 2017 Under Employee Stock Purchase Plan

The table below details the shares of common stock issued during 2017:

	Number of shares	Per share price
Shares available as of December 31, 2016	189,611
Shares issued during three months ended March 31, 2017	5,891	$	43.42
Shares available as of March 31, 2017	183,720