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Derivative Instruments (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 3,600,000    
Derivative Assets (Liabilities), at Fair Value, Net 5,400,000 $ 5,400,000  
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net loss on derivatives not designated as hedging instruments $ (200,000) $ (6,400,000) $ (11,800,000)