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Equity-Method Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Equity Method Investment Recorded in Consolidated Statements of Operations | The following amounts related to this equity-method investment were recorded in our Consolidated Statements of Operations (in thousands):
Year Ended December 31, |  | 2017 |  | 2016 |  | 2015
Asset impairments to write investment down to fair value |  | $ | — |  |  | $ | 13,992 |  |  | $ | 16,521 |
Our portion of the partnership’s operating losses |  | — |  |  | 8,262 |  |  | 6,929 |
Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions |  | — |  |  | 185 |  |  | 674 |
Tax benefits and credits generated |  | — |  |  | 28,530 |  |  | 30,831 |

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