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Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Summary of entity's dividends per common share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Declared Dividends |  | Dividends Paid
​ |  | per Common Share |  | (in thousands)
2021 | ​ |  |  | ​ |  |
Q3 | ​ | $ | 0.145 | ​ | $ | 22,506
Q2 | ​ | ​ | 0.145 | ​ | ​ | 22,331
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

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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: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration