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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Summary of Awards

The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:

		Year Ended December 31,
Restricted Shares and Performance-Based Shares		2017				2016				2015
Expected quarterly dividends per share		$	0.2425			$	0.2200			$	0.2000
Risk-free interest rate		1.50		%		0.94		%		0.92		%
Market-Based Shares
Dividend yield		2.67		%		2.74		%		2.87		%
Expected volatility		20.80		%		20.44		%		18.73		%
Risk-free interest rate		1.54		%		0.97		%		1.00		%

The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options:

		Restricted Stock							Stock Options
		Shares			Weighted-Average Grant Date Fair Value				Shares			Weighted Average Exercise Price
Outstanding at December 31, 2016		218,316			$	27.59			305,874			$	12.29
Granted		248,271			$	23.06			—			$	—
Exercised		(273,530	)		$	21.01			(109,433	)		$	15.89
Forfeited		(4,012	)		$	29.96			—			$	—
Expired		—			$	—			(3,000	)		$	30.50
Outstanding at December 31, 2017		189,045			$	31.11			193,441			$	9.98

The following table provides additional information concerning restricted stock activity, including performance-based and market-based shares, and stock options:

		Year Ended December 31,
Restricted Stock		2017				2016				2015
Weighted-average grant date fair value		$	23.06			$	26.49			$	20.34
Total fair value of restricted shares that vested (in thousands)		$	5,747			$	5,079			$	6,507
Stock Options
Weighted-average grant date fair value of options granted		$	—			$	—			$	—
Total fair value of options that vested (in thousands)		$	—			$	—			$	—
Total intrinsic value of options exercised (in thousands)		$	2,234			$	1,242			$	2,350

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- References

No definition available.

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- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

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