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Derivative Instruments and Hedging Activities - Effective Portion of Gains (Losses) on Interest Rate Swap Agreements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative [Line Items]        
Amount of Loss Recognized in OCI $ 2,942 $ (959) $ 24,001 $ (69,593)
Interest expense        
Derivative [Line Items]        
Amount of Loss Recognized in OCI 1,040 616 5,080 (9,610)
Amount of Loss Reclassified from Accumulated OCI to Interest Expense $ (840) $ (835) $ (2,480) $ (1,469)