Derivative Instruments - Notional Amounts of Derivative Instruments (Details) $ in Thousands, Mcf in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) Mcf	Dec. 31, 2019 USD ($) Mcf
Commodity Member
Derivative [Line Items]
Notional amount	1,387.1	1,460.6
Basis Swap
Derivative [Line Items]
Notional amount	1,235.9	1,290.4
Interest Rate Swap
Derivative [Line Items]
Derivative notional amount | $	$ 585,000	$ 160,000