Stockholders' Equity and Stock-based Compensation Arrangements (Tables)

3 Months Ended

Mar. 31, 2013

Stockholders' Equity and Stock-based Compensation Arrangements

Schedule of compensation cost and the income tax benefit recognized for the plans

	Three Months Ended March 31,
	2013		2012
Compensation cost included in:
Basic income per share	$	0.01	$	0.01
Diluted income per share	$	0.01	$	0.01
Stock-based compensation expense	96		111
Income tax benefit	21		26

Schedule of information regarding the stock plans

	Number of Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contract Life (in years)	Aggregate Intrinsic Value
Outstanding, January 1, 2013	641,050	$	22.12
Outstanding, March 31, 2013	641,050	$	22.12	4.8	$	2,799
Exercisable, March 31, 2013	589,050	$	22.76	4.7	$	2,291

Schedule of key assumptions used for fair value of options granted under the Purchase Plan

	Three Months Ended March 31,
	2013	2012
Risk-free interest rate	0.2%	0.2%
Weighted-average expected life of option feature (in years)	1.0	1.0
Expected volatility of underlying stock	28.7%	28.6%
Expected dividends	n/a	n/a
Weighted-average fair value of option feature	$5.98	$7.19

Schedule of information regarding the Purchase Plan

	Number of Options		Weighted- Average Exercise Price		Remaining Contract Life (in years)	Aggregate Intrinsic Value
Outstanding, January 1, 2013	12,641		$	20.56
Shares subscribed	7,389		20.56
Exercised	—		—
Forfeited	(664	)	20.56
Outstanding, March 31, 2013	19,366		$	20.56	0.3	$	65