Capital Stock (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 shares	Dec. 31, 2011	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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance		0
Share Repurchase Program
Stock repurchased during period | $		$ 0
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)	4,832,240
Shares under options and warrants outstanding (in shares)	2,222,333	2,708,273	3,035,987
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	1,367,500
Shares of common stock remaining to be granted (in shares)	1,242,407
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) | Right					1
Number of rights issued with each issuance of common stock (per right) | 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 | $ / shares					0.01
Exercise price of right (in dollars per share) | $ / shares					$ 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) | $ / shares					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%