Stockholders' Equity (Details)		3 Months Ended				6 Months Ended	12 Months Ended	48 Months Ended	156 Months Ended
	Jun. 04, 2020 shares	Jun. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares shares	Jun. 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
Total Dividends | $		$ 9,654,000	$ 9,654,000	$ 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