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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details)				3 Months Ended
	Dec. 24, 2018 USD ($)	May 07, 2018 USD ($) shares	Mar. 19, 2014 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares	May 08, 2018 USD ($)
Debt Instrument [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares				$ 0.01		$ 0.01
Amortization of Debt Issuance Costs				$ 94,000	$ 208,000
Interest Expense				6,328,000	3,735,000
Carrying value of the liability component				$ 319,261,000		$ 319,108,000
Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion | shares		2,822,859
Convertible subordinated notes, principal amount	$ 22,418,000.16	$ 115,000,000	$ 143,750,000			6,346,000	$ 28,800,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	78.00%
Stated interest rate percentage			2.75%	2.75%
Debt Instrument, Convertible, Conversion Ratio			44.3169	45.1383
Long-term Debt, Fair Value				$ 6,800,000
Interest Expense, Debt				0	988,000
Amortization of Debt Issuance Costs				$ 6,000	132,000
Debt Instrument, Convertible, Remaining Discount Amortization Period				23 months
Accretion of discount, convertible subordinated notes				$ 57,000	$ 1,160,000
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares			$ 22.56	$ 22.15
Effective interest rate percentage				3.15%	11.3199%
Interest Rate, Unamortized Debt Discount, Effective Percentage				11.40%
Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle	$ 22,900,000	74,800,000
Interest Expense	200,000	400,000
Payments for Repurchase of Redeemable Convertible Preferred Stock	23,000,000	$ 75,200,000
Carrying value of the liability component	$ 6,346,000			$ 5,796,000		$ 5,732,000

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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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