Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Share Grants Activity

The following table represents the share grants stock activity for the year ended December 31, 2018:

	Restricted stock				Options
	Number of Shares		Weighted average grant date fair value		Number of Shares		Weighted average grant date fair value
Share grants outstanding at December 31, 2017	529,465		$	37.34	—		$	—
Granted	257,175		64.11		—		—
Acquired	—		—		270,710		36.48
Vested or exercised	(212,355	)	37.77		(108,903	)	34.11
Share grants outstanding at December 31, 2018	574,285		$	49.68	161,807		$	38.08

Schedule of Stock Option Outstanding, by Exercise Price Range

The following table summarizes information about stock options outstanding and exercisable at December 31, 2018:

Range of Exercise Price	Shares	Wtd. Avg. Remaining Contractual Life	Wtd. Avg. Exercise Price
$0.00 - 30.00	47,579	4.47	$	24.93
$30.01 - 40.00	71,684	6.23	$	39.43
Over $40.00	42,544	7.73	$	50.51

161,807 6.46 $ 38.08

Summary of Shares Issued Under Employee Stock Purchase Plan

The following table represents the shares issued during 2018, 2017 and 2016 under the Employee Stock Purchase Plan:

	Number of Shares	Weighted Average Per Share Price
Shares available as of December 31, 2015	213,760
Shares issued in 2016	24,149	$	37.79
Shares issued in 2017	18,542	$	55.40
Shares issued in 2018	18,725	$	71.12
Shares available as of December 31, 2018	152,344