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Derivative Instruments (Fair Value) (Details) - Interest Rate Swap - Designated as Hedging Instrument - USD ($)
Mar. 31, 2021
Mar. 31, 2020
Jan. 31, 2020
Derivative [Line Items]      
Derivative, notional amount $ 200,000,000.0   $ 400,000,000.0
Cash Flow Hedging      
Derivative [Line Items]      
Derivative, notional amount 200,000,000 $ 200,000,000  
Other Accrued Liabilities | Cash Flow Hedging      
Derivative [Line Items]      
Derivative liability (2,363,000)    
Other Long-Term Liabilities      
Derivative [Line Items]      
Derivative liability   (4,412,000)  
Other Long-Term Liabilities | Cash Flow Hedging      
Derivative [Line Items]      
Derivative liability $ 0    
Other Current Liabilities      
Derivative [Line Items]      
Derivative liability   $ (1,905,000)