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Fair Value Measurements and Derivative Instruments Reporting (Fair value of derivative insturments in Statement of Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Interest Expense [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Gain (loss) on derivative instruments $ 169 $ 289 $ 320 $ 289