Capital Stock (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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)	$ 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)	4,301,854
Shares under options and warrants outstanding (in shares)	1,046,833	1,556,833	2,222,333
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	1,634,663
Shares of common stock remaining to be granted (in shares)	1,620,358