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Net Income Per Share and Stockholders' Equity, Anti Dilution Table (Details)
3 Months Ended 6 Months Ended
Apr. 07, 2016
Jun. 30, 2018
shares
Jun. 30, 2017
shares
Jun. 30, 2018
shares
Jun. 30, 2017
shares
Dec. 31, 2017
shares
Apr. 22, 2016
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Antidilutive securities excluded from computation of earnings per share   2,000 55,000 1,000 56,000    
Authorized number of shares of Series A Preferred Stock (shares)   5,000,000   5,000,000   5,000,000  
Non-vested common shares, restricted stock units and performance shares              
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Antidilutive securities excluded from computation of earnings per share   2,000 55,000 1,000 56,000    
Series A Preferred Stock [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Preferred Stock, Rights Conversion Ratio into Preferred Stock 1            
Authorized number of shares of Series A Preferred Stock (shares)             900,000