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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments (Details) - Interest rate swaps - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative labilities   $ (29,000)
Variation margin   44,800
Trading    
Derivative [Line Items]    
Derivative assets $ 0 $ 15,878