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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details)		3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 24, 2018 USD ($)	Mar. 19, 2014
Debt Instrument [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01		$ 0.01
Deferred Tax Liabilities, Convertible Subordinated Notes	$ 100,000	$ 100,000
Amortization of Debt Issuance Costs		200,000	$ 94,000
Interest Expense		8,428,000	6,328,000
Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]
Convertible subordinated notes, principal amount				$ 6,318,837
Stated interest rate percentage						2.75%
Debt Instrument, Convertible, Conversion Ratio	45.5554
Long-term Debt, Fair Value	$ 6,400,000	6,400,000
Interest Expense, Debt		43,000	$ 44,000
Amortization of Debt Issuance Costs		$ 6,000
Debt Instrument, Convertible, Remaining Discount Amortization Period		11 months
Debt Instrument, Discount Rate		11.40%	11.40%
Accretion of discount, convertible subordinated notes		$ 65,000	$ 57,000
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares	$ 21.95	$ 21.95
Carrying value of the liability component	$ 6,042,000	$ 6,042,000		$ 5,971,000	$ 6,319,000
Debt Instrument, Unamortized Debt Issuance Costs		3.20%	3.20%

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Amount of accretion of discount for the standardized measure of discounted future net cash flow related to proved oil and gas reserves.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Contractual interest rate for funds borrowed, under the debt agreement.

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