Derivative Instruments - Assets and Liabilities (Details) - USD ($) $ in Thousands		12 Months Ended
Dec. 08, 2017	Dec. 31, 2019	Dec. 31, 2018
Assets
Gross Fair Value		$ 89,763	$ 134,980
Gross Amounts Offset		(46,318)	(45,847)
Total derivative assets		43,445	89,133
Liabilities
Gross Fair Value		(51,634)	(46,543)
Gross Amounts Offset		46,318	45,847
Net Recognized Fair Value		(5,316)	(696)
Commodity Derivative \| Derivative Asset, Current
Assets
Gross Fair Value		28,512	46,972
Gross Amounts Offset		(18,172)	(16,153)
Total derivative assets		10,340	30,819
Commodity Derivative \| Derivative Asset, Noncurrent
Assets
Gross Fair Value		61,241	88,008
Gross Amounts Offset		(28,136)	(29,694)
Total derivative assets		33,105	58,314
Commodity Derivative \| Derivative Liability, Current
Liabilities
Gross Fair Value		(22,014)	(16,153)
Gross Amounts Offset		18,172	16,153
Net Recognized Fair Value		(3,842)	0
Commodity Derivative \| Derivative Liability, Noncurrent
Liabilities
Gross Fair Value		(28,528)	(29,694)
Gross Amounts Offset		28,136	29,694
Net Recognized Fair Value		(392)	0
Interest Rate Derivative \| Derivative Asset, Current
Assets
Gross Fair Value		10
Gross Amounts Offset		(10)
Total derivative assets		0
Interest Rate Derivative \| Derivative Liability, Current
Liabilities
Gross Fair Value		(184)
Gross Amounts Offset		10
Net Recognized Fair Value		(174)
Interest Rate Derivative \| Derivative Liability, Noncurrent
Liabilities
Gross Fair Value		(492)
Gross Amounts Offset		0
Net Recognized Fair Value		(492)
Series B Preferred Stock Bifurcated Derivative \| Derivative Liability, Noncurrent
Liabilities
Gross Fair Value		(416)	(696)
Gross Amounts Offset		0	0
Net Recognized Fair Value		$ (416)	$ (696)
Series B Preferred Stock
Derivative [Line Items]
Series B preferred stock, dividend rate	10.00%	10.00%	10.00%

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