Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Stock-Based Compensation

Schedule of amounts recognized in the consolidated financial statements related to stock-based compensation

	Years Ended December 31,
	2012			2011			2010
Total cost of stock-based compensation	$	464,470		$	388,904		$	261,859
Amount of income tax benefit recognized in earnings		(77,009	)		(111,882	)		(28,646	)
Amount charged against net income	$	387,461		$	277,022		$	233,213

Schedule of assumptions used to estimate the fair value of options granted using Black-Scholes model

	2012			2011			2010
Dividend yield		2.7	%		2.7	%		3.3	%
Expected volatility		42	%		42	%		41	%
Risk-free interest rate		1.0	%		1.1	%		2.0	%
Expected lives (in years)		5.6			5.6			5.7

Schedule of information regarding the Company's stock option plans

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Options outstanding, December 31, 2009		937,250		$	8.84		4.2	$	881,656
Granted		123,600			12.96
Exercised		(134,865	)		6.76
Cancelled or expired		(13,423	)		8.41
Options outstanding, December 31, 2010		912,562			9.71		4.1		2,962,426
Granted		132,900			16.00
Exercised		(203,801	)		8.41
Cancelled or expired		(11,875	)		9.08
Options outstanding, December 31, 2011		829,786			11.05		4.1		4,108,291
Granted		128,700			14.40		7.0
Exercised		(108,624	)		8.56
Cancelled or expired		(11,200	)		14.30
Options outstanding, December 31, 2012		838,662		$	11.84		3.9	$	2,346,063
Options exercisable, December 31, 2012		628,737		$	11.01		3.1	$	2,256,812

Summary of the status of the Company's unvested option shares

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at December 31, 2011		204,225		$	4.00
Options granted		128,700			4.18
Options cancelled		(10,050	)		4.26
Options vested		(112,950	)		4.11
Unvested at December 31, 2012		209,925		$	4.04