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Stockholders' Equity (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 04, 2020 shares | Mar. 31, 2021 USD ($) item $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares
Stockholders' Equity |  |  |  |
Common Stock, Shares, Outstanding | shares |  | 107,328,199 |  | 107,328,199
Dividends declared and paid |  |  |  |
Cash dividend declared per share (in dollars per share) | $ / shares |  | $ 0.09 | $ 0.09 |
Total Dividends | $ |  | $ 9,660,000 | $ 9,654,000 |
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 | shares |  | 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 | 1,906,382
Shares Granted | shares | (58,998) |  |  | (58,998)
Number of shares available for grant under the plan, Ending | shares |  | 1,847,384 |  | 1,847,384
Compensation Cost, Beginning | $ |  | $ 674,000 | $ 337,000 | $ 337,000
Compensation cost | $ |  |  |  | 337,000
Compensation Cost, Ending | $ |  | $ 674,000 |  | $ 674,000

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