Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Nonvested Stock Activity

The following table represents the nonvested stock activity for the year ended December 31, 2016:

	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested shares outstanding at January 1, 2016	527,091		$	26.64
Granted	236,100		37.99
Vested	(174,969	)	25.72
Forfeited	(13,511	)	25.27
Nonvested shares outstanding at December 31, 2016	574,711		$	31.61

Summary of Shares Issued Under Employee Stock Purchase Plan

The following table represents the shares issued during 2016, 2015 and 2014 under the Employee Stock Purchase Plan:

	Number of Shares	Weighted Average Per Share Price
Shares available as of December 31, 2013	272,788
Shares issued in 2014	36,305	$	21.49
Shares issued in 2015	22,723	$	34.37
Shares issued in 2016	24,149	$	37.79
Shares available as of December 31, 2016	189,611