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Derivative Financial Instruments (Fair Value) (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Deferred income taxes and other long-term liabilities $ 514,000 $ 603,000
Derivative designated as a cash flow hedge | Interest rate swap    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount 18,109,000 18,406,000
Derivative designated as a cash flow hedge | Interest rate swap | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Deferred income taxes and other long-term liabilities $ 514,000 $ 603,000