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Senior Notes Aggregate Maturities (Details) - Senior Notes [Member] - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Principal Maturity
2021	$ 0
2022	0
2023	0
2024	0
2025	0
Thereafter	400,000,000
Principal Maturity	400,000,000
Discount Amortization
2020	(565,000)
2021	(605,000)
2022	(648,000)
2023	694,000
2024	(744,000)
Thereafter	(326,000)
Discount Amortization	3,582,000	$ 4,110,000
Debt Instrument, Unamortized Premium	1,467,000
Debt Instrument, Premium Amortized After Year Five	132,000
Debt Instrument, Premium Amortized in Year Five	301,000
Debt Instrument, Premium Amortized in Year Four	283,000
Debt Instrument, Premium Amortized in Year Three	266,000
Debt Instrument, Premium Amortized in Year Two	250,000
Debt Instrument, Premium Amortized in Next Twelve Months	235,000
Present Value
2020	(330,000)
2021	(355,000)
2022	(382,000)
2023	(411,000)
2024	(443,000)
Thereafter	399,806,000
Present Value	$ 397,885,000

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