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Stockholders' Equity (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 04, 2021 USD ($) | May 20, 2021 USD ($) shares | Jun. 04, 2020 shares | Sep. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) item shares | Dec. 31, 2020 USD ($) shares
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | shares |  |  |  | 105,632,725 |  |  |  |  |  | 105,632,725 | 107,328,199
Dividends declared and paid |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared per share (in dollars per share) | $ / shares |  |  |  | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 |  |
Total Dividends | $ |  |  |  | $ 9,666,000 | $ 9,659,000 | $ 9,660,000 | $ 9,660,000 | $ 9,654,000 | $ 9,654,000 |  |
General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Equity-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Compensation cost | $ | $ 337,500 | $ 337,500 |  |  |  |  |  |  |  |  |
2002 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Equity-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares provided for grant under equity-based incentive compensation plan | shares |  |  |  | 2,000,000 |  |  |  |  |  | 2,000,000 |
Number of vesting requirements | item |  |  |  |  |  |  |  |  |  | 0 |
Number of shares available for grant under the plan, Beginning | shares |  |  |  |  |  | 1,847,384 |  |  | 1,906,382 | 1,847,384 | 1,906,382
Shares Granted | shares |  | (66,564) | (58,998) |  |  |  |  |  |  | (66,564) | (58,998)
Number of shares available for grant under the plan, Ending | shares |  |  |  | 1,780,820 |  |  |  |  |  | 1,780,820 | 1,847,384
Compensation Cost, Beginning | $ |  |  |  |  |  | $ 675,000 |  |  | $ 337,500 | $ 675,000 | $ 337,500
Compensation cost | $ |  |  |  |  |  |  |  |  |  | 337,500 | 337,500
Compensation Cost, Ending | $ |  |  |  | $ 1,012,500 |  |  |  |  |  | $ 1,012,500 | $ 675,000

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