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Fair Value Measurements And Derivative Instruments Reporting (Derivative Instruments In The Consolidated Statement Of Earnings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Expense [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Gain on derivative instruments $ 712 $ 953 $ 476