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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
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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

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