Capital Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Mar. 21, 2011
Capital Stock [Abstract]
Capital stock, shares authorized (in shares)	32,000,000
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Common stock reserved for issuance (in shares)	3,907,686
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Share Repurchase Plan [Abstract]
Authorized amount under share repurchase plan by Board of Directors	$ 3,000,000
Stock repurchased during period	$ 531,000	$ 1,649,000
Preferred Stock Rights [Abstract]
Date on which dividends payable was declared by Board of Directors	Mar. 21, 2011
Number of preferred stock purchase right declared for each outstanding common stock (per right)			1
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Number of rights issued with each issuance of common stock (per right)			1
Term of stockholder protection rights agreement			3Y
Maximum period that can be extended for right plan			P3Y0M0D
Fraction of participating preferred stock that can be exercised as a result of right			0.01
Exercise price of right (in dollars per share)			$ 8.00
Percentage of common stock required to exercise the right (in hundredths)			20.00%
Minimum percentage of common stock owned for right to become exercisable (in hundredths)			20.00%
Redemption price per right (in dollars per share)			$ 0.001
Number of common stock exchange for rights (in shares)			1
Percentage of common stock acquired to cause substantial dilution (in hundredths)			20.00%
Long Term Incentive Stock Option Plan 1995 [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock remaining to be granted (in shares)	836,883