Summary of Significant Accounting Policies Detail (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Cash, cash equivalents and restricted cash, end of year	$ 963	$ 9,399	$ 189,925
Document Period End Date	Dec. 31, 2019
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 20,100		11,300
Non-Oil and gas Depreciation, Depletion and Amortization	5,700	8,500	6,600
Capitalized Interest	13,400	9,200	$ 5,000
Production Tax Liability	68,020	61,310
Cash and cash equivalents	963	1,398
Restricted Cash		8,000
Capitalized Computer Software, Gross	$ 25,900	$ 1,400
Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	35 years
Adjustments for New Accounting Pronouncement [Member]
Significant Accounting Policies [Line Items]
Other Accrued Expense	$ 4,600
Other Liabilities	$ 15,500