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Equity | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Equity | 11. Equity At-the-Market Continuous Equity Offering Program On February 23, 2021, we entered into the ATM Agreement, pursuant to which we may offer and sell shares of our common stock from time to time for an aggregate offering price of up to $50.0 million. We intend to use the net proceeds of these offerings, after deducting sales agent fees and offering expenses, for general corporate purposes. Offerings of common stock pursuant to the ATM Agreement will terminate upon the earlier of (i) the sale of all shares of common stock subject to the ATM Agreement or (ii) the termination of the ATM Agreement by us or by each of the sales agents. Any sales agent may also terminate the ATM Agreement but only with respect to itself. During the three months ended March 31, 2021, we sold 357,148 shares of common stock for net proceeds of $3.4 million pursuant to the ATM Agreement. Cash Dividends The following table summarizes our dividends declared and paid in each of the quarterly periods of 2021 and 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Declared Dividends |  | Dividends Paid
​ |  | per Common Share |  | (in thousands)
2021 | ​ |  |  | ​ |  |
Q1 | ​ | $ | 0.145 | ​ | $ | 22,155
​ | ​ | ​ | ​ | ​ | ​ | ​
2020 |  | ​ |  |  | ​ |
Q4 | ​ | $ | 0.145 | ​ | $ | 22,177
Q3 | ​ |  | 0.145 | ​ |  | 22,308
Q2 | ​ |  | 0.145 | ​ |  | 22,176
Q1 | ​ |  | 0.145 | ​ |  | 22,171
​ On April 28, 2021, our Board of Directors declared a quarterly dividend of $0.145 per share of common stock to be paid on May 17, 2021 to stockholders of record at the close of business on May 10, 2021.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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