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Derivatives, Investments and Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 09, 2019
Dec. 10, 2018
Dec. 08, 2017
Aug. 26, 2017
Jan. 23, 2017
Fair Value, Measurements, Recurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate swap contract       $ 828  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate swap contract       $ 828  
Term Loan | Interest Rate Swap [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notional amount         $ 200,000
Interest rate, stated percentage         6.32%
Scenario, Forecast [Member] | Term Loan | Interest Rate Swap [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notional amount $ 60,000 $ 120,000 $ 170,000