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Stock-Based Compensation Plan (Details) - Independent directors compensation plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding, Beginning balance	900	900
Exercisable, Beginning balance	900	900
Granted
Exercised
Forfeited
Outstanding, Ending balance	900	900
Exercisable, Ending balance	900	900
Average Exercise Price per Share
Outstanding, Beginning balance	$ 54.0	$ 54.0
Exercisable, Beginning balance	54.0	54.0
Granted
Exercised
Forfeited
Outstanding, Ending balance	54.0	54.0
Exercisable, Ending balance	$ 54.0	$ 54.0
Weighted Average Remaining Contractual Term in Years
Outstanding, Beginning balance	5 years 4 months 28 days
Exercisable, Beginning balance	5 years 4 months 28 days
Granted	0 years
Exercised	0 years
Forfeited	0 years
Outstanding, Ending balance	4 years 4 months 28 days
Exercisable, Ending balance	4 years 4 months 28 days

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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