Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2018

Stock Options Plan [Member]

Summary of Transactions of Company's Stock Option Plans

The following table summarizes the transactions of the Company’s stock option plans for the three months ended March 31, 2018:

	Number of Options			Weighted Average Exercise Price		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2017		357,666		$	13.74	$	35.69
Granted - at discount		71,227		$	0.00	$	57.53
- at market value		18,850		$	68.20	$	16.23
Exercised		(69,569	)	$	13.83	$	26.40
Forfeited		(11,874	)	$	19.69	$	27.17
Outstanding at March 31, 2018		366,300		$	13.66	$	40.97

Stock Equivalent Units [Member]

Summarizes Transactions of SEUs

The following table summarizes the transactions of the Company’s SEUs for the three months ended March 31, 2018:

	Number of SEUs			Weighted Average Exercise Price		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2017		400,342		$	3.10	$	46.65
Granted - at discount		101,278		$	0.00	$	57.44
- at market value		5,658		$	68.20	$	16.23
Exercised		(48,852	)	$	3.57	$	28.12
Forfeited		(16,554	)	$	1.40	$	37.14
Outstanding at March 31, 2018		441,872		$	3.23	$	51.14