Fair Value Measurements Schedule of Fair Value of Liabilities (Details) - USD ($)			12 Months Ended
	May 22, 2020	Mar. 15, 2019	Dec. 31, 2020	Dec. 31, 2021	Mar. 26, 2021	Mar. 19, 2021	Dec. 31, 2019	Nov. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, net			$ 1,068,624,000	$ 825,565,000
Fair Value Measurement Input, Credit Spread	12.00%
Fair Value Measurement Input, Yield Volatility	45.00%
Proved Property [Member] | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Undiscounted cash flows exceeding carrying values			30.00%
Proved Property [Member] | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Undiscounted cash flows exceeding carrying values			100.00%
Proved Property [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure			$ 179,600,000				$ 771,400,000
Asset Impairment Charges			591,800,000
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, net			738,624,000	800,565,000
Senior Notes Due 2026 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			206,955,000	286,554,000
Long-term debt			289,448,000	289,448,000				$ 400,000,000
Interest rate, stated percentage								5.375%
Senior Notes Due 2027 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			254,791,000	361,696,000
Long-term debt		$ 500,000,000	356,351,000	356,351,000
Debt Instrument, Issued Price, Percentage		99.235%
Interest rate, stated percentage		6.875%
Senior Secured Note due 2025 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			114,366,000	0
Long-term debt	$ 127,100,000		127,073,000	0
Debt Instrument, Issued Price, Percentage	83.44%
Interest rate, stated percentage	8.00%
Convertible Senior Notes Due 2028 | Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			0	215,279,000
Long-term debt			0	170,000,000	$ 20,000,000	$ 150,000,000
Interest rate, stated percentage						3.25%
Carrying Value | Senior Notes Due 2026 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, net			284,867,000	285,666,000
Carrying Value | Senior Notes Due 2027 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, net			349,856,000	350,712,000
Carrying Value | Senior Secured Note due 2025 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, net			103,901,000	0
Carrying Value | Convertible Senior Notes Due 2028 | Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, net			0	164,187,000
Revolving Credit Facility | Line of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			330,000,000	25,000,000
Long-term Debt, Gross			330,000,000	25,000,000
Long-term debt			330,000,000	25,000,000
Revolving Credit Facility | Carrying Value | Line of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Gross			$ 330,000,000	$ 25,000,000