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Senior Notes Aggregate Maturities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	May 31, 2018
Principal Maturity
2020	$ 1,289,000
2021	1,023,000
2022	523,000
2023	84,363,000
2024	550,000
Thereafter	3,016,000
Senior Notes [Member]
Principal Maturity
2020	0
2021	0
2022	0
2023	0
2024	0
Thereafter	400,000,000
Principal Maturity	400,000,000		$ 325,000,000
Discount Amortization
2020	(528,000)
2021	(565,000)
2022	(605,000)
2023	648,000
2024	(694,000)
Thereafter	(1,070,000)
Discount Amortization	4,110,000	$ 4,602,000
Debt Instrument, Unamortized Premium	1,688,000
Debt Instrument, Premium Amortized After Year Five	433,000
Debt Instrument, Premium Amortized in Year Five	283,000
Debt Instrument, Premium Amortized in Year Four	266,000
Debt Instrument, Premium Amortized in Year Three	250,000
Debt Instrument, Premium Amortized in Year Two	235,000
Debt Instrument, Premium Amortized in Next Twelve Months	221,000
Present Value
2020	(307,000)
2021	(330,000)
2022	(355,000)
2023	(382,000)
2024	(411,000)
Thereafter	399,363,000
Present Value	$ 397,578,000

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