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Derivative Instruments and Hedging Activities - Acitivity of Derivative Instruments Not Designated as Hedges (Details) - Not Designated as Hedging Instrument, Trading - Interest rate swaps - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]
Beginning Balance	$ 495,500	$ 345,500
Additions	0	150,000
Settlement, Expiration or Exercise	0	0
Ending Balance	$ 495,500	$ 495,500