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Summary of Significant Accounting Policies (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | [1] | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 4,295 | $ 3,695 | $ 4,171 | $ 1,529 | $ 14,859 | $ 2,965 | $ 3,375 | $ 1,047 | $ 13,690 | $ 22,246 | $ 12,910
Less: Income allocated to unvested participating securities |  |  |  |  |  |  |  |  | 256 | 370 | 231
Income from continuing operations available to common stockholders |  |  |  |  |  |  |  |  | 13,434 | 21,876 | 12,679
Income from discontinued operations | $ 0 | $ 0 | $ 0 | $ 0 | $ (30) | $ 30,451 | $ 1,159 | $ 891 | 0 | 32,471 | 5,276
Less: Income allocated to unvested participating securities |  |  |  |  |  |  |  |  | 0 | 541 | 94
Income from discontinued operations available to common stockholders |  |  |  |  |  |  |  |  | 0 | 31,930 | 5,182
Net income available to common stockholders |  |  |  |  |  |  |  |  | $ 13,434 | $ 53,806 | $ 17,861
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share-weighted average shares | 5,820 | 5,822 | 5,834 | 5,842 | 5,815 | 5,807 | 5,803 | 5,795 | 5,829 | 5,803 | 5,761
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  | 0 | 4 | 10
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions | 5,820 | 5,822 | 5,834 | 5,842 | 5,815 | 5,807 | 5,806 | 5,808 | 5,829 | 5,807 | 5,771
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
From continuing operations | $ 0.72 | $ 0.62 | $ 0.70 | $ 0.26 | $ 2.52 | $ 0.50 | $ 0.57 | $ 0.18 | $ 2.30 | $ 3.77 | $ 2.20
From discontinued operations | 0 | 0 | 0 | 0 | (0.01) | 5.16 | 0.20 | 0.15 | 0 | 5.50 | 0.90
Basic earnings per share | 0.72 | 0.62 | 0.70 | 0.26 | 2.51 | 5.66 | 0.77 | 0.33 | 2.30 | 9.27 | 3.10
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
From continuing operations | 0.72 | 0.62 | 0.70 | 0.26 | 2.52 | 0.50 | 0.57 | 0.18 | 2.30 | 3.77 | 2.19
From discontinued operations | 0 | 0 | 0 | 0 | (0.01) | 5.16 | 0.20 | 0.15 | 0 | 5.50 | 0.90
Diluted earnings per share | $ 0.72 | $ 0.62 | $ 0.70 | $ 0.26 | $ 2.51 | $ 5.66 | $ 0.77 | $ 0.33 | $ 2.30 | $ 9.27 | $ 3.09
[1] | March 31, 2017 quarterly data have been reclassified to conform with current presentation.

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