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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative [Line Items]        
Amount of Loss Recognized in OCI $ (16,948) $ (11,081) $ 21,059 $ (68,634)
Interest expense        
Derivative [Line Items]        
Amount of Loss Recognized in OCI (435) (1,055) 4,040 (10,226)
Amount of Loss Reclassified from Accumulated OCI to Interest Expense $ (825) $ (482) $ (1,640) $ (634)