Capital Stock (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 shares	Mar. 21, 2011 $ / shares Right shares
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, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01		$ 0.01
Long Term Incentive Stock Option Plan 1995 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	4,892,641
Shares under options and warrants outstanding (in shares)	1,556,833	2,222,333	2,708,273
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	1,688,480
Shares of common stock remaining to be granted (in shares)	1,647,328
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 | Right				1
Number of rights issued with each issuance of common stock | Right				1
Term of stockholder protection rights agreement	3 years
Rights Agreement Amendment Date	Mar. 21, 2014
Rights Agreement Expiration Date	Mar. 21, 2016
Fraction of participating preferred stock that can be exercised as a result of right | $ / shares				0.01
Exercise price of right (in dollars per share) | $ / shares				$ 8.00
Percentage of common stock required to exercise the right				20.00%
Minimum percentage of common stock owned for right to become exercisable				20.00%
Redemption price per right (in dollars per share) | $ / shares				0.001
Number of common stock exchange for rights (in shares)				1
Term of the Rights Agreement extension	2 years