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Financial Instruments - Derivatives and Hedging (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
derivative_instrument
Dec. 31, 2019
USD ($)
derivative_instrument
Dec. 31, 2018
USD ($)
Derivative [Line Items]      
Amount expected to be reclassified from accumulated other comprehensive loss in the next twelve months | $ $ 10,300,000    
Designated as Hedging Instrument | Interest Rate Swap      
Derivative [Line Items]      
Number of Instruments | derivative_instrument 7 7  
Gain (loss) on derivative | $ $ 0 $ 0 $ 0
Designated as Hedging Instrument | Interest Rate Swap | Entered in Current Period      
Derivative [Line Items]      
Number of Instruments | derivative_instrument 0