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Financial Instruments - Derivatives and Hedging (Narrative) (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2021
derivative_instrument
Jun. 30, 2021
USD ($)
derivative_instrument
Jun. 30, 2020
USD ($)
Maximum      
Debt Instrument [Line Items]      
Amount expected to be reclassified from accumulated other comprehensive loss in the next twelve months   $ 7,900,000  
Interest Rate Swap | Designated as Hedging Instrument      
Debt Instrument [Line Items]      
Number of instruments entered | derivative_instrument 0 0  
Termination fees   $ 1,100,000  
Terminated notional amount   250,000,000.0  
Gain (loss) on derivative   $ 0 $ 0