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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Stockholders' Equity |
Schedule of dividends declared and paid | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Dividends Per | ​ | Total |
Quarter Paid |  | Share |  | Dividends |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
First quarter of 2021 |  | $ | 0.09 |  | $ | 9,660 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
First quarter of 2020 |  | $ | 0.09 |  | $ | 9,654 | ​
Schedule of Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Shares Available | ​ | Compensation
(in thousands) | ​ | for Grant | ​ | Cost
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance December 31, 2019 | ​ | ​ | 1,906,382 | ​ | ​ | 337,000
Shares granted 2020 | ​ | ​ | (58,998) | ​ | ​ | 337,000
Balance December 31, 2020 | ​ | ​ | 1,847,384 | ​ | $ | 674,000
Shares granted 2021 | ​ | ​ | - | ​ | ​ | -
Balance March 31, 2021 | ​ | ​ | 1,847,384 | ​ | $ | 674,000
​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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