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Senior Notes Aggregate Maturities (Details) - USD ($)
Dec. 31, 2018
May 31, 2018
Principal Maturity    
2019 $ 2,015,000  
2020 1,298,000  
2021 1,046,000  
2022 553,000  
2023 27,689,000  
Thereafter 3,439,000  
Senior Notes [Member]    
Principal Maturity    
2019 0  
2020 0  
2021 0  
2022 0  
2023 0  
Thereafter 325,000,000  
Principal Maturity 325,000,000 $ 325,000,000
Discount Amortization    
2019 (493,000)  
2020 (528,000)  
2021 (565,000)  
2022 (605,000)  
2023 (648,000)  
Thereafter (1,763,000)  
Discount Amortization 4,602,000  
Present Value    
2019 (493,000)  
2020 (528,000)  
2021 (565,000)  
2022 (605,000)  
2023 (648,000)  
Thereafter 323,237,000  
Present Value $ 320,398,000