Stock Options and Other Equity-Based Incentive Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Activity

Stock option activity is summarized in the following table for the dates indicated:

	Number of Shares			Option Price per Share		Weighted Average Exercise Price
Outstanding at January 1, 2018		446,400		$	12.63 to $23.21	$	16.84
Options granted		—			— to —		—
Options exercised		(100,400	)	$	12.63 to $23.21	$	16.97
Options forfeited		(3,000	)	$	23.21	$	23.21
Outstanding at December 31, 2018		343,000		$	12.63 to $23.21	$	16.67

Summary of Options Outstanding

The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of December 31, 2018:

	Currently Exercisable		Currently Not Exercisable		Total Outstanding
Number of options		341,875		1,125		343,000
Weighted average exercise price	$	16.65	$	23.21	$	16.67
Intrinsic value (in thousands)	$	5,860	$	12	$	5,872
Weighted average remaining contractual term (yrs.)		3.2		5.8		3.3

Information about Options

The following table shows the total intrinsic value of options exercised, the total fair value of options vested, total compensation costs for options recognized in income, total tax benefit and excess tax benefits recognized in income related to compensation costs for options during the periods indicated:

	Year Ended December 31,
	2018		2017		2016
Intrinsic value of options exercised	$	2,109,000	$	2,657,000	$	3,483,000
Fair value of options that vested	$	75,000	$	259,000	$	580,000
Total compensation costs for options recognized in income	$	75,000	$	259,000	$	580,000
Total tax benefit recognized in income related to compensation costs for options	$	22,000	$	109,000	$	244,000
Excess tax benefit recognized in income	$	623,000	$	600,000	$	—

Restricted Stock Unit (RSU) Activity

Restricted stock unit activity is summarized in the following table for the dates indicated:

	Service Condition Vesting RSUs					Market Plus Service Condition Vesting RSUs
	Number of RSUs			Weighted Average Fair Value on Date of Grant		Number of RSUs			Weighted Average Fair Value on Date of Grant
Outstanding at January 1, 2018		68,457					52,829
RSUs granted		38,605		$	39.08		16,939		$	36.40
Additional market plus service condition RSUs vested		—					8,506
RSUs added through dividend credits		1,188					—
RSUs released through vesting		(35,060	)				(25,512	)
RSUs forfeited/expired		(6,243	)				(7,226	)
Outstanding at December 31, 2018		66,947					45,536

Summary of Compensation Costs and Excess Tax Benefits for RSUs

The following table shows the compensation costs and excess tax benefits for RSUs recognized in income for the periods indicated:

	Year Ended December 31,
	2018		2017		2016
Total compensation costs recognized in income
Service condition vesting RSUs	$	1,017,000	$	895,000	$	616,000
Market plus service condition vesting RSUs	$	370,000	$	432,000	$	271,000
Excess tax benefit recognized in income
Service condition vesting RSUs	$	104,000	$	131,000	$	—
Market plus service condition vesting RSUs	$	191,000	$	175,000	$	—