Financial Instruments (Tables)	9 Months Ended
Sep. 30, 2021
Financial Instruments [Abstract]
Summary Of Unrealized Gain And Losses	Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020Net gain recognized during the period on equity securities $ 196 $ 305 $ 695 $ 244Less: net gain / loss recognized during the period on equity securities sold during the period - - - -Unrealized gain recognized during the reporting period on equity securities still held at the reporting date $ 196 $ 305 $ 695 $ 244
Schedule Of Carrying Amounts And Estimated Fair Values Of Long-Term Debt	September 30, December 31, 2021 2020Carrying amount $ 5,702,379 $ 5,630,243Estimated fair value 6,299,160 6,366,030

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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