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Unaudited Quarterly Consolidated Financial Information Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations | $ (13,937) | $ 13,895 | $ 37,064 | $ 25,922 | $ (30,377) | $ 2,685 | $ 29,446 | $ 15,582 | $ 62,944 | $ 17,336 | $ (6,154)
Charges related to noncash write-off and contract termination fee |  |  |  |  | $ 6,300 |  |  |  |  |  |

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