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Equity and EPS - Computations of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operations: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 12,947 | $ 8,215 | $ 7,911 | $ 9,720 | $ 11,822 | $ 9,008 | $ 7,527 | $ 8,927 | $ 38,793 | $ 37,284 | $ 41,823
Less: Income attributable to participating securities (unvested shares and units) |  |  |  |  |  |  |  |  | 253 | 708 | 996
Net income attributable to common shareholders and used in Earnings Per Share calculation |  |  |  |  |  |  |  |  | $ 38,540 | $ 36,576 | $ 40,827
Share information: |  |  |  |  |  |  |  |  |  |  |
Basic and diluted weighted average common shares (in shares) |  |  |  |  |  |  |  |  | 17,012,288 | 16,866,176 | 16,746,731
Basic and diluted EPS (in dollars per share) | $ 0.76 | $ 0.48 | $ 0.46 | $ 0.57 | $ 0.69 | $ 0.52 | $ 0.44 | $ 0.52 | $ 2.27 | $ 2.17 | $ 2.44
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Participating securities (in shares) |  |  |  |  |  |  |  |  | 111,365 | 326,375 | 368,492

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