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Selected Quarterly Financial Data (Details) - USD ($) | 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 35,628,000 |  | $ 35,912,000 |  | $ 35,660,000 |  | $ 36,883,000 |  | $ 36,932,000 |  | $ 36,170,000 |  | $ 41,350,000 |  | $ 37,568,000 |  | $ 144,083,000 | $ 152,020,000 | $ 146,008,000
Net income (loss) | (9,914,000) |  | 2,947,000 |  | 5,544,000 |  | 2,989,000 |  | 4,736,000 |  | 6,305,000 |  | 9,937,000 |  | (16,620,000) |  | 1,566,000 | 4,358,000 | 19,653,000
Net income (loss) attributable to common shareholders | $ (12,657,000) |  | $ 92,000 |  | $ 2,695,000 |  | $ 194,000 |  | $ 1,932,000 |  | $ 3,472,000 |  | $ 7,089,000 |  | $ (22,974,000) |  | $ (9,676,000) | $ (10,481,000) | $ (2,399,000)
Per common share (basic and diluted) | $ (0.15) | [1] | $ 0.00 | [1] | $ 0.03 | [1] | $ 0.00 | [1] | $ 0.02 | [1] | $ 0.04 | [1] | $ 0.08 | [1] | $ (0.26) | [1] | $ (0.12) | $ (0.13) | $ (0.04)
[1] | Differences between the sum of the four quarterly per share amounts and the annual per share amounts, if any, are attributable to the effect of the weighted average outstanding share calculation for the respective periods.

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