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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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