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Financial Instruments - Derivatives and Hedging (Notional Amount) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
derivative_instrument
Dec. 31, 2019
USD ($)
derivative_instrument
Derivative [Line Items]    
Amount expected to be reclassified from accumulated other comprehensive loss in the next twelve months $ 10,300  
Interest Rate Swap | Designated as Hedging Instrument    
Derivative [Line Items]    
Number of Instruments | derivative_instrument 7 7
Notional Amount $ 800,000 $ 800,000