Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - Interest Rate Swap $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]
Beginning balance	$ 495,500
Additions	0
Terminations	(495,500)
Ending balance	$ 0