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Net Income Per Share and Stockholders' Equity, Anti Dilution Table (Details) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 07, 2016 | Mar. 31, 2018 shares | Mar. 31, 2017 shares | Dec. 31, 2017 shares | Apr. 22, 2016 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 1,543 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 0 | 64,000 |  |
Preferred Stock, Shares Authorized |  | 5,000,000 |  | 5,000,000 |
Options to purchase common shares [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 0 | 2,000 |  |
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, Amount |  | 0 | 64,000 |  |
Series A Preferred Stock [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |  |
Preferred Stock, Rights Conversion Ratio into Preferred Stock | 1 |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 900,000

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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