Derivative Instruments - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Apr. 30, 2019
Derivative [Line Items]
Change in unrealized gain (loss) on hedged item		$ (10,639,000)	$ 0
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:		151,161,000	$ (41,382,000)
Interest Rate Swap
Derivative [Line Items]
Derivative notional amount	$ 585,000,000	585,000,000		$ 160,000,000
Interest Rate Swap | Interest Expense
Derivative [Line Items]
Cash paid on settlement of derivatives		(57,000)
Change in unrealized gain (loss) on hedged item		(10,639,000)
Gain (loss) on derivative, net		$ (10,696,000)
Interest Rate Swap on Line of Credit | Long
Derivative [Line Items]
Put option	0.25%	0.25%
Interest Rate Swap on Revolving Credit Facility | Long
Derivative [Line Items]
Put option	0.00%	0.00%
Term of derivative contract	4 years
Derivative notional amount	$ 250,000,000	$ 250,000,000
NYMEX Commodity Swaps | Natural Gas
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:		54,982,000
Line of Credit
Derivative [Line Items]
Credit facility, face amount	175,000,000	175,000,000
Revolving Credit Facility
Derivative [Line Items]
Credit facility, face amount	$ 160,000,000	$ 160,000,000			$ 2,100,000,000
Credit facility, modification period		3 years