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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details)					3 Months Ended		6 Months Ended
	Apr. 04, 2019 USD ($)	Dec. 24, 2018 USD ($)	May 07, 2018 USD ($) shares	Mar. 19, 2014 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 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		$ 0.01
Amortization of Debt Issuance Costs							$ 189,000	$ 320,000
Interest Expense					$ 6,296,000	$ 4,743,000	12,624,000	8,478,000
Payments for Repurchase of Redeemable Convertible Preferred Stock							27,000	75,229,000
Carrying value of the liability component					$ 319,418,000		$ 319,418,000		$ 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	$ 25,000	$ 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%	80.00%
Stated interest rate percentage				2.75%	2.75%		2.75%
Debt Instrument, Convertible, Conversion Ratio				44.3169			45.2619
Long-term Debt, Fair Value					$ 6,400,000		$ 6,400,000
Interest Expense, Debt					0	514,000	87,000	1,502,000
Amortization of Debt Issuance Costs					$ 5,000	$ 62,000	$ 11,000	$ 194,000
Debt Instrument, Discount Rate					11.40%	11.40%	11.40%	11.40%
Accretion of discount, convertible subordinated notes					$ 60,000	$ 555,000	$ 117,000	$ 1,715,000
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares				$ 22.56	$ 22.09		$ 22.09
Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle	$ 0	$ 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		$ 6,321,000			$ 5,835,000		$ 5,835,000		$ 5,732,000
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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