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Financial Instruments - Derivatives and Hedging (Notional Amount) (Details) - Interest Rate Swap - Designated as Hedging Instrument
$ in Thousands
Jun. 30, 2021
USD ($)
derivative_instrument
Dec. 31, 2020
USD ($)
derivative_instrument
Derivative [Line Items]    
Number of Instruments | derivative_instrument 5 7
Notional Amount | $ $ 550,000 $ 800,000