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Acquisitions (Pro Forma Information) (Details) (Costar Midstream, L.L.C. [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified |
12 Months Ended | |
|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Costar Midstream, L.L.C. [Member]
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| Business Acquisition [Line Items] | ||
| Revenue | $ 435,133 | $ 448,748 |
| Net loss | $ (101,237) | $ (30,672) |
| Limited partners' net loss per unit | $ (6.15) | $ (3.82) |