Debt - Credit Facility - Wells Fargo Bank (Details) $ in Thousands	9 Months Ended
Sep. 30, 2016 USD ($) redetermindation	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Debt outstanding	$ 497,813	$ 487,807
Wells Fargo [Member] \| Senior Unsecured Notes due 2021 [Member] \| Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt outstanding	450,000	$ 450,000
Wells Fargo [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000,000
Number of additional redeterminations that may be requested \| redetermindation	3
Period of redeterminations (in months)	12 months
Current borrowing base	$ 700,000
Elected borrowing base	500,000
Financial covenant, maximum issuance of unsecured debt	$ 750,000
Financial covenant, reduction of borrowing base (percentage)	25.00%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Quarterly commitment fee percentage based on unused portion of borrowing base	0.375%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Quarterly commitment fee percentage based on unused portion of borrowing base	0.50%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	0.50%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	1.00%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	1.50%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	2.50%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	0.50%
Wells Fargo [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	1.50%

Line of Credit Facility, Borrowing Base, Number of Redeterminations

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- Definition

Line of Credit Facility, Borrowing Base, Period of Redetermination

+ References

No definition available.

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- Definition

Line of Credit Facility, Decrease of Borrowing Base, Percentage

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Terms, Maximum Issuance of Additional Indebtedness

+ References

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- Definition

Line of Credit Facility, Elected Borrowing Base

+ References

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

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.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

No definition available.

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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.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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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