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Capital Stock and Changes in Capital Accounts, textuals 2 (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Share-based Arrangements with Employees and Nonemployees [Abstract] |  |  |
Compensation cost on restricted stock | $ 3,399 | $ 5,503 | $ 5,503
Unrecognized cost for unvested restricted shares | $ 24,097 |  | $ 3,978
Total Compensation Cost Not yet Recognized, Period for Recognition | 2 years 1 month 24 days |  |

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