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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 24, 2018	Mar. 19, 2014
Debt Instrument [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01		$ 0.01
Convertible Notes amortization of debt issuance costs			$ 393,000	$ 189,000
Interest Expense	$ 8,352,000	$ 6,296,000	16,780,000	12,624,000
Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]
Convertible subordinated notes, principal amount					$ 6,319,000
Stated interest rate percentage							2.75%
Long-term Debt, Fair Value	6,400,000		6,400,000
Senior Notes interest expense	43,000	44,000	87,000	87,000
Convertible Notes amortization of debt issuance costs	$ 6,000	$ 5,000	$ 12,000	$ 11,000
Debt Instrument, Convertible, Remaining Discount Amortization Period			8 months
Debt Instrument, Discount Rate	11.40%	11.40%	11.40%	11.40%
Convertible Notes accretion of debt discount	$ 66,000	$ 59,000	$ 131,000	$ 117,000
Carrying value of the liability component	$ 6,115,000		$ 6,115,000		$ 5,971,000	$ 6,319,000
Debt Instrument, Unamortized Debt Issuance Costs	3.20%	3.20%	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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Amount of amortization expense attributable to debt issuance costs.

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Face amount or stated value per share of common stock.

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Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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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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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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