Stockholder's Equity (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Nonvested Stock Activity

The following table represents the nonvested stock activity for the six months ended June 30, 2016:

	Number of shares		Weighted average grant date fair value
Nonvested shares outstanding as of December 31, 2015	527,091		$	26.64
Granted	211,100		$	38.18
Vested	(160,612	)	$	25.88
Forfeited	(12,566	)	$	24.36
Nonvested shares outstanding as of June 30, 2016	565,013		$	31.22

Shares of Common Stock Issued During 2016 Under Employee Stock Purchase Plan

The table below details the shares of common stock issued during 2016:

	Number of shares	Per share price
Shares available as of December 31, 2015	213,760
Shares issued during the three months ended March 31, 2016	5,341	$	43.03
Shares issued during the three months ended June 30, 2016	6,434	$	33.78
Shares available as of June 30, 2016	201,985