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Equity and EPS - The Computations of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operations: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 11,822 | $ 9,008 | $ 7,527 | $ 8,927 | $ 12,639 | $ 14,137 | $ 6,369 | $ 8,678 | $ 37,284 | $ 41,823 | $ 31,184
Less: Income attributable to participating securities (unvested shares and units) |  |  |  |  |  |  |  |  | 708 | 996 | 954
Net income attributable to common shareholders and used in Earnings Per Share calculation (Note 7) |  |  |  |  |  |  |  |  | $ 36,576 | $ 40,827 | $ 30,230
Share information: |  |  |  |  |  |  |  |  |  |  |
Basic and diluted weighted average common shares (in shares) |  |  |  |  |  |  |  |  | 16,866,176 | 16,746,731 | 16,643,811
Basic and diluted EPS (in dollars per share) | $ 0.69 | $ 0.52 | $ 0.44 | $ 0.52 | $ 0.74 | $ 0.82 | $ 0.37 | $ 0.50 | $ 2.17 | $ 2.44 | $ 1.82

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