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Debt (Details) - USD ($) | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | May 03, 2017 | Apr. 28, 2017 | Feb. 17, 2017 | Dec. 31, 2016 | Dec. 09, 2016 | Apr. 14, 2015
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Senior unsecured notes | $ 573,968,000 |  |  |  | $ 573,924,000 |  |
Deferred loan costs |  |  |  |  | $ 1,200,000 |  |
Repay deficit in agreement period | 6 months |  |  |  |  |  |
Third Amended Credit Agreement [Member] |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Amended maximum borrowing capacity | $ 500,000,000 |  |  |  |  |  |
Senior Notes | Senior Notes Due 2023 |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Senior unsecured notes | $ 575,000,000 |  |  |  |  | $ 175,000,000 | $ 400,000,000
Interest rate | 6.875% |  |  |  |  | 6.875% | 6.875%
Subsequent Event [Member] | Senior Notes | Senior Notes Due 2023 |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Senior unsecured notes |  | $ 575,000,000.0 |  |  |  |  |
Interest rate |  | 6.875% |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Borrowings under Credit Agreement | $ 0 |  |  |  |  |  |
Maximum borrowing capacity | 400,000,000 |  |  |  |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Borrowings under Credit Agreement |  | $ 0 |  |  |  |  |
Maximum borrowing capacity |  |  | $ 450,000,000 |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Outstanding letters of credit | $ 800,000 |  |  |  |  |  |
Letter of Credit [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Outstanding letters of credit |  | $ 800,000 |  |  |  |  |
Corporate Joint Venture [Member] | San Mateo Midstream [Member] |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |
Ownership percentage | 51.00% |  |  | 51.00% |  |  |

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