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Discontinued Operations (Cash Flow Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |
Net cash provided by (used in) discontinued operating activities |  | $ 0 | $ 10,948
Hereford Production Facility | Discontinued Operations, Disposed of by Sale |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |
Net cash provided by (used in) discontinued operating activities | $ (1,804) |  | 10,948
Net cash used in discontinued investing activities | $ (1,183) |  | $ (4,945)

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