Debt Instrument, Covenant Terms, Aggregate Principal Amount Related to Payment Defaults or Accelerations

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- Definition

Debt Instrument, Covenant Terms, Amount of Failure to Pay Final Judgments

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No definition available.

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- Definition

Debt Instrument, Covenant Terms, Percentage of Principal Amount Outstanding

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- Definition

Debt Instrument, Covenant Terms, Period after Notice to Comply with Agreements in Indenture

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- Definition

Debt Instrument, Covenant Terms, Period after Notice to comply with Reporting Obligations

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No definition available.

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- Definition

Debt Instrument, Covenant Terms, Period for Failure to Pay Final Judgments

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No definition available.

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- Definition

Debt Instrument, Covenant Terms, Period of Default when Due of Interest

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No definition available.

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- Definition

Debt Instrument, Redemption Price, Percentage of Aggregate Principal Amount of Notes Outstanding After Redemption

+ References

No definition available.

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- Definition

Line of credit amendment date.

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No definition available.

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- Definition

Line of credit facility amended maximum borrowing capacity.

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No definition available.

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- Definition

Line of credit additional interest rate.

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No definition available.

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- Definition

Line of Credit Facility, Covenant, Debt to EBITDA Ratio

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No definition available.

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- Definition

Percentage of reserves required to maintain.

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No definition available.

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- Definition

Repay deficit in agreement period.

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No definition available.

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- Definition

Revolving credit agreement.

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No definition available.

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- Definition

Unamortized deferred finance costs.

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No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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- Definition

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

+ References

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

The carrying value as of the balance sheet date of the noncurrent portion 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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Revolving Credit Agreement (Details Textual) - USD ($)			1 Months Ended	12 Months Ended
Revolving Credit Agreement (Details Textual) - USD ($)	Dec. 09, 2016	Apr. 14, 2015	Sep. 30, 2012	Dec. 31, 2017	Feb. 21, 2018	Sep. 30, 2017	Feb. 17, 2017	Dec. 31, 2016	Oct. 31, 2016	Oct. 21, 2015	Sep. 28, 2012
Revolving Credit Agreement (Textual) [Abstract]
Deferred loan costs				$ 1,000,000
Repay deficit in agreement Period				6 months
Borrowings under Credit Agreement				$ 0
Outstanding letters of credit				2,100,000
Borrowings interest rate		50.00%
Senior unsecured notes payable				$ 574,073,000				$ 573,924,000
Proceeds from Issuance or Sale of Equity	$ 181,500,000
Subsidiary ownership percentage				100.00%
Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Company amended and restated its senior secured revolving credit agreement			September 28, 2012
Senior secured revolving credit maximum facility									$ 525,000,000		$ 400,000,000
Maximum borrowing capacity, amended				$ 500,000,000
Percentage of reserves required to maintain				100.00%
Debt to EBITDA ratio covenant				4.25
Subsequent Event [Member]
Revolving Credit Agreement (Textual) [Abstract]
Borrowings under Credit Agreement					$ 0
Outstanding letters of credit					$ 2,100,000
LIBOR rate [Member] \| Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Borrowings interest rate				1.00%
Maximum [Member] \| Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Commitment fee percentage				0.50%
Minimum [Member] \| Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Commitment fee percentage				0.375%
Minimum [Member] \| Base rate loan [Member]
Revolving Credit Agreement (Textual) [Abstract]
Additional interest rate				0.50%
Eurodollar [Member] \| Maximum [Member] \| Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Additional interest rate				2.50%
Eurodollar [Member] \| Minimum [Member] \| Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Additional interest rate				1.50%
Unsecured Debt [Member] \| Senior Notes Due 2023 [Member]
Revolving Credit Agreement (Textual) [Abstract]
Senior unsecured notes payable	$ 175,000,000	$ 400,000,000
Stated interest rate		6.875%								6.875%
Effective interest rate				5.50%
Percentage of principal amount redeemed		35.00%
Percentage of aggregate principal amount of notes outstanding after redemption		65.00%
Percentage of principal amount outstanding		25.00%
Period of default when due of interest		30 days
Period after notice to comply with reporting obligations		180 days
Period after notice to comply with agreements in indenture		60 days
Aggregate principal amount related to payment defaults or accelerations		$ 25,000,000.0
Amount of failure to pay final judgments		$ 25,000,000.0
Period for failure to pay final judgments		60 days
Federal Funds Effective Rate [Member] \| Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Borrowings interest rate				0.50%
Base rate loan [Member] \| Maximum [Member] \| Third amended credit agreement [Member]
Revolving Credit Agreement (Textual) [Abstract]
Additional interest rate				1.50%
Debt Redemption, 2018 [Member] \| Unsecured Debt [Member] \| Senior Notes Due 2023 [Member]
Revolving Credit Agreement (Textual) [Abstract]
Redemption Price		105.156%
Percentage of principal amount redeemed	105.50%	106.875%
Debt Redemption, 2019 [Member] \| Unsecured Debt [Member] \| Senior Notes Due 2023 [Member]
Revolving Credit Agreement (Textual) [Abstract]
Redemption Price		103.438%
Debt Redemption, 2020 [Member] \| Unsecured Debt [Member] \| Senior Notes Due 2023 [Member]
Revolving Credit Agreement (Textual) [Abstract]
Redemption Price		101.719%
Debt Redemption, 2021 and thereafter [Member] \| Unsecured Debt [Member] \| Senior Notes Due 2023 [Member]
Revolving Credit Agreement (Textual) [Abstract]
Redemption Price		100.00%
Revolving Credit Facility [Member]
Revolving Credit Agreement (Textual) [Abstract]
Senior secured revolving credit maximum facility				$ 400,000,000
Corporate Joint Venture [Member] \| San Mateo Midstream [Member]
Revolving Credit Agreement (Textual) [Abstract]
Subsidiary ownership percentage						51.00%	51.00%