Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

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

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following summarizes the significant assumptions used to determine the fair value of performance shares and related compensation expense as well as the resulting estimated fair value of performance shares granted:

	2012		2011
Risk-free interest rate	0.38	%	1.40	%
Expected life, in years	3		3
Expected volatility	20.2% to 34.2%		25.6% to 47.0%
Dividend yield	4.1	%	4.9	%

Schedule of Nonvested Share Activity

A summary of nonvested shares as of and changes during the year ended December 31, 2012, are as follows:

	Performance Share Awards				Restricted Stock Awards
	Shares		Weighted-Average Grant-Date Fair Value		Shares		Weighted-Average Grant-Date Fair Value
Beginning nonvested grants	204,713		$	20.07	2,000		$	25.44
Granted	86,546		25.18		2,500		35.78
Vested	(100,723	)	19.66		(3,500	)	33.01
Forfeited	(3,781	)	20.96		—		—
Remaining nonvested grants	186,755		$	22.64	1,000		$	24.77

Share-based Compensation Arrangement by Share-based Payment Award

Schedule of Nonvested Restricted Stock Units Activity

A summary of nonvested shares as of and changes during the year ended December 31, 2012, are as follows:

	Shares	Weighted-Average Grant-Date Fair Value
Beginning nonvested grants	8,596	$	28.00
Granted	8,941	27.42
Vested	—	—
Forfeited	—	—
Remaining nonvested grants	17,537	$	27.70