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Fair Value Measurements and Derivative Instruments Reporting (Derivative Instruments In The Consolidated Statement Of Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Interest Expense [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Gain on derivative instruments $ 278 $ 222