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Stockholders' Equity (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 48 Months Ended | 156 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 04, 2020 shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) item shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2005 shares | Dec. 31, 2018 shares
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  | 107,328,199 |  |  |  |  |  | 107,328,199 | 107,269,201 |  |
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 | $ |  | $ 9,660,000 | $ 9,654,000 | $ 9,654,000 | $ 9,651,000 | $ 9,651,000 | $ 9,651,000 |  |  |  |
General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Equity-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Compensation cost | $ |  | $ 337,000 |  |  |  |  |  |  |  |  |
2002 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Equity-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares provided for grant under equity-based incentive compensation plan |  | 2,000,000 |  |  |  |  |  | 2,000,000 |  |  |
Number of vesting requirements | item |  |  |  |  |  |  |  | 0 |  |  |
Number of shares available for grant under the plan, Beginning |  |  |  | 1,906,382 |  |  | 1,944,428 | 1,906,382 | 1,944,428 |  |
Shares Granted | (58,998) |  |  |  |  |  |  | (58,998) | (38,046) | (55,572) | 0
Number of shares available for grant under the plan, Ending |  | 1,847,384 |  |  |  |  |  | 1,847,384 | 1,906,382 |  | 1,944,428
Compensation cost | $ |  | $ 337,000 |  |  |  |  |  | $ 674,000 | $ 337,000 |  |

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