Stockholder's Equity (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Nonvested Stock Activity

The following table represents the nonvested stock activity for the nine months ended September 30, 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	(191,463	)	$	28.91
Forfeited	(3,793	)	$	39.30
Nonvested shares outstanding as of September 30, 2017	530,465		$	37.35

Shares of Common Stock Issued During 2016 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 the three months ended March 31, 2017	5,891	$	43.42
Shares issued during the three months ended June 30, 2017	4,152	$	51.21
Shares issued during the three months ended September 30, 2017..........................................................	4,775	$	64.49
Shares available as of September 30, 2017	174,793