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

12 Months Ended

Dec. 31, 2017

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

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 December 31, 2016		592,250		$	12.63	to	$	23.21	$	17.12
Options granted		—			—	to		—		—
Options exercised		(145,850	)	$	14.54	to	$	22.54	$	17.97
Options forfeited		—			—	to		—		—
Outstanding at December 31, 2017		446,400		$	12.63	to	$	23.21	$	16.84

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, 2017:


	Currently Exercisable		Currently Not Exercisable		Total Outstanding
Number of options		422,100		24,300		446,400
Weighted average exercise price	$	16.65	$	20.21	$	16.84
Intrinsic value (in thousands)	$	8,953	$	429	$	9,382
Weighted average remaining contractual term (yrs.)		3.8		5.7		3.9

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, and total tax benefit recognized in income related to compensation costs for options during the periods indicated:


	Years Ended December 31,
	2017		2016		2015
Intrinsic value of options exercised	$	2,657,000	$	3,483,000	$	969,000
Fair value of options that vested	$	259,000	$	580,000	$	734,000
Total compensation costs for options recognized in income	$	259,000	$	580,000	$	734,000
Total tax benefit recognized in income related to compensation costs for options	$	109,000	$	244,000	$	380,000
Excess tax benefit recognized in income	$	906,000		—		—

Restricted Stock Unit (RSU) Activity

Restricted stock unit (RSU) 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 December 31, 2016		68,450					47,426
RSUs granted		29,669			$35.36		17,939			$32.95
Additional market plus service condition RSUs vested							6,269
RSUs added through dividend credits		1,245					—
RSUs released		(30,896	)				(18,805	)
RSUs forfeited/expired		(11	)				—
Outstanding at December 31, 2017		68,457					52,829

Summary of Compensation Costs for RSUs

The following table shows the compensation costs for RSUs recognized in income for the periods indicated:


	Year Ended December 31,
	2017		2016		2015
Total compensation costs for RSUs recognized in income:
Service condition vesting RSUs	$	895,000	$	616,000	$	458,000
Market plus service condition vesting RSUs	$	432,000	$	271,000	$	179,000