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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of dividends declared and paid | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Dividends Per | ​ | Total |
Quarter Paid |  | Share |  | Dividends |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
First quarter of 2019 |  | $ | 0.09 |  | $ | 9,651 | ​
Second quarter of 2019 |  | $ | 0.09 |  | $ | 9,651 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
First quarter of 2018 |  | $ | 0.19 |  | $ | 20,374 | ​
Second quarter of 2018 |  | $ | 0.09 |  | $ | 9,651 | ​
​

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- Definition Tabular disclosure of information related to dividends declared, including paid and unpaid dividends. + References No definition available. + Details
Name: | us-gaap_DividendsDeclaredTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration