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Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Selected Quarterly Financial Data |
|  | Quarter ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 36,883,000 |  |  | $ | 35,660,000 |  |  | $ | 35,912,000 |  |  | $ | 35,628,000 |
Net income (loss) |  | $ | 2,989,000 |  |  | $ | 5,544,000 |  |  | $ | 2,947,000 |  |  | $ | (9,914,000 | )
Net income (loss) attributable to common shareholders |  | $ | 194,000 |  |  | $ | 2,695,000 |  |  | $ | 92,000 |  |  | $ | (12,657,000 | )
Per common share (basic and diluted) (a) |  | $ | 0.00 |  |  | $ | 0.03 |  |  | $ | 0.00 |  |  | $ | (0.15 | )
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 37,568,000 |  |  | $ | 41,350,000 |  |  | $ | 36,170,000 |  |  | $ | 36,932,000 |
Net (loss) income |  | $ | (16,620,000 | ) |  | $ | 9,937,000 |  |  | $ | 6,305,000 |  |  | $ | 4,736,000 |
Net (loss) income attributable to common shareholders |  | $ | (22,974,000 | ) |  | $ | 7,089,000 |  |  | $ | 3,472,000 |  |  | $ | 1,932,000 |
Per common share (basic and diluted) (a) |  | $ | (0.26 | ) |  | $ | 0.08 |  |  | $ | 0.04 |  |  | $ | 0.02 |
(a) | 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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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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