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Debt and Hedging Instruments (Interest Rate Hedge Contracts Narrative) (Details) - Interest Rate Swap - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Interest income   $ (900)    
Interest expense     $ 200 $ 1,900
Scenario, Forecast        
Debt Instrument [Line Items]        
Interest expense $ 300      
Designated as Hedging Instrument        
Debt Instrument [Line Items]        
Derivative (liability) assets, net   (260) 1,867  
Designated as Hedging Instrument | Cash Flow Hedging        
Debt Instrument [Line Items]        
Derivative, notional amount   $ 210,000 $ 210,000  
Derivative, fixed interest rate   2.08%