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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Details) - Interest rate swaps
$ in Thousands
Dec. 31, 2019
USD ($)
Derivative [Line Items]  
Derivative in liability position $ (29,000)
Variation margin 44,800
Not Designated as Hedging Instrument, Trading  
Derivative [Line Items]  
Derivatives not designated as hedging instruments - assets $ 15,878