Capital Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Mar. 21, 2011	Dec. 31, 2012
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)	3,856,240
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 0.01
Share Repurchase Program
Stock repurchased during period		$ 819,000
Share Repurchase Plan Completion Date	Oct. 31, 2013
Preferred Stock Rights Agreement [Member]
Preferred Stock Rights
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
Number of rights issued with each issuance of common stock (per right)				1
Term of stockholder protection rights agreement	3 years
Rights Agreement Amendment Date		Mar. 21, 2014
Term of the Rights Agreement extension	2 years
Rights Agreement Expiration Date		Mar. 21, 2016
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%
Treasury Stock [Member]
Share Repurchase Program
Authorized amount under share repurchase plan by Board of Directors	3,000,000
Stock repurchased during period (in shares)	0	494,424
Stock repurchased during period	$ 0	$ 819,000
Long Term Incentive Stock Option Plan 1995 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares under options and warrants outstanding (in shares)	2,708,273	3,035,987			3,070,803
Shares of common stock remaining to be granted (in shares)	1,147,967