Partners' Capital Partners' Capital (Distribution Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Distribution Made to Limited Partner [Line Items]
Partners' Capital, Distribution, Fixed Charge Coverage Ratio Threshold	1.75
Payments of Capital Distribution	$ 0.0
General partner's incentive distribution rights	$ 0.0
Minimum \| Greater of borrowing base
Distribution Made to Limited Partner [Line Items]
Partners' Capital, After Distribution Required Threshold Percentage	15.00%
Partners' Capital, After Distribution Required Cash Amount	$ 60.0
Minimum \| Lesser of Credit Facility Commitments
Distribution Made to Limited Partner [Line Items]
Partners' Capital, After Distribution Required Threshold Percentage	10.00%
Partners' Capital, After Distribution Required Cash Amount	$ 35.0
Maximum \| Greater of borrowing base
Distribution Made to Limited Partner [Line Items]
Partners' Capital, After Distribution Required Threshold Percentage	25.00%
Maximum \| Lesser of Credit Facility Commitments
Distribution Made to Limited Partner [Line Items]
Partners' Capital, After Distribution Required Threshold Percentage	15.00%
7.625% Notes \| Maximum
Distribution Made to Limited Partner [Line Items]
Debt restrictions on earning distributions	$ 210.0
7.75% Notes \| Maximum
Distribution Made to Limited Partner [Line Items]
Debt restrictions on earning distributions	225.0
11.00% Notes \| Maximum
Distribution Made to Limited Partner [Line Items]
Debt restrictions on earning distributions	$ 25.0

Debt restrictions on earning distributions

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- Definition

Partners' Capital, After Distribution Required Cash Amount

+ References

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- Definition

Partners' Capital, After Distribution Required Threshold Percentage

+ References

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Partners' Capital, Distribution, Fixed Charge Coverage Ratio Threshold

+ References

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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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- Definition

Amount of incentive obligation paid in cash or stock during the period to a limited liability corporation managing member or limited partnership general partner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Cash outflow to owners or shareholders, excluding ordinary dividends. Includes special dividends.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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