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Financial Instruments (Estimated Fair Values of Financial Instruments) (Parenthetical) (Details)
Dec. 31, 2018
USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Liabilities held for sale $ 29,321,000
Revenue bonds [Member]  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Liabilities held for sale $ 29,000