Accrued and unpaid interest for the last interest payment date to the redemption date

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The percentage to be added to the adjusted LIBO rate in determining the base interest rate.

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- Definition

Current Ratio

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No definition available.

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The cash outflow associated with the redemption of senior debt, which also includes the premium paid to redeem the senior debt

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No definition available.

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The percentage to be added to the Federal Funds Effective Rate in determining the base interest rate.

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No definition available.

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Amount of current borrowing capacity under the credit facility elected by the Company, considering any current restrictions on the amount that could be borrowed, but without considering any amount currently outstanding under the credit facility.

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No definition available.

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Represents the threshold of the pre-tax SEC PV-10 reserve value that if exceeded, a mortgage lien on the oil and natural gas property exists as collateral for borrowings under the Senior Secured Revolving Credit Facility.

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No definition available.

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- Definition

Ratio of Total Debt to EBITDA

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No definition available.

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The price at which the Company may redeem the debt, stated as a percentage of the principal amount.

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No definition available.

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The percentage of voting interest of a subsidiary guarantor owned by the reporting entity which is considered to determine whether the reporting entity is required to provide condensed consolidating financial information.

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No definition available.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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Weighted average interest rate of debt outstanding.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Long-Term Debt (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended
Long-Term Debt (Narrative) (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) Rate	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Cash paid for debt redemption			$ 336,900
Redemption Premium			6,000
Accrued interest paid associated with redemption of debt			10,900
Loss on extinguishment of debt	$ 0	$ 0	8,700	$ 0	$ 8,676
Write off of Deferred Debt Issuance Cost			2,700
Voting interest of the subsidiary owned by the registrant	100.00%			100.00%
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 1,350,000			$ 1,350,000
Line of Credit Facility, Elected Borrowing Capacity	1,250,000			1,250,000
Line of credit facility amount outstanding	$ 841,328			$ 841,328		$ 744,431
Debt, Weighted Average Interest Rate	4.14%			4.14%
Pre-Tax SEC PV10 Reserve Value Percentage \| Rate				90.00%
Federal funds rate plus percentage	0.50%			0.50%
Ratio of total debt to EBITDA				2.40
Current Ratio	1.73			1.73
Adjusted LIBO rate plus percentage	1.00%			1.00%
Senior Secured Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of total debt to EBITDA				4.00
Senior Secured Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Current Ratio	1.00			1.00
7.50% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.50%			7.50%
Debt Instrument, Repurchased Face Amount			$ 320,000
Redemption price, percentage of principal amount			101.875%
8.25% Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt	$ 250,000			$ 250,000		$ 250,000
Other Long Term Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.375%			4.375%
Debt Instrument, Repurchased Face Amount		$ 4,400			$ 4,400
Cash paid for debt redemption		4,500
Accrued interest paid associated with redemption of debt		$ 100
Redemption price, percentage of principal amount		100.00%			100.00%