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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information |
Schedule of quarterly financial information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the quarter ended |
​ | ​ | March 31, | ​ | June 30, | ​ | September 30, | ​ | December 31, |
​ | ​ | (unaudited, in thousands except per share amounts) |
2019 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​
Revenues | ​ | $ | 45,456 | ​ | $ | 46,266 | ​ | $ | 47,119 | ​ | $ | 46,463 | ​
Net income available to common stockholders | ​ | $ | 20,254 | ​ | $ | 20,352 | ​ | $ | 27,080 | ​ | $ | 12,449 | ​
Net income per common share available to common stockholders: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 0.51 | ​ | $ | 0.51 | ​ | $ | 0.68 | ​ | $ | 0.31 | ​
Diluted | ​ | $ | 0.51 | ​ | $ | 0.51 | ​ | $ | 0.68 | ​ | $ | 0.31 | ​
Dividends per share declared | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​
Dividends per share paid | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​
2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Revenues | ​ | $ | 41,810 | ​ | $ | 41,472 | ​ | $ | 41,776 | ​ | $ | 43,587 | ​
Net income available to common stockholders | ​ | $ | 20,271 | ​ | $ | 68,658 | ​ | $ | 34,782 | ​ | $ | 30,645 | ​
Net income per common share available to common stockholders: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 0.51 | ​ | $ | 1.74 | ​ | $ | 0.88 | ​ | $ | 0.78 | ​
Diluted | ​ | $ | 0.51 | ​ | $ | 1.73 | ​ | $ | 0.88 | ​ | $ | 0.77 | ​
Dividends per share declared | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​
Dividends per share paid | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​ | $ | 0.57 | ​
​ | ​
NOTE: | Quarterly and year-to-date computations of per share amounts are made independently. Therefore, the sum of per share amounts for the quarters may not agree with the per share amounts for the year.

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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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