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Correction of Immaterial Errors Correction of Immaterial Errors (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) | $ 34,824 | $ (12,599) | $ (8,893) | $ (6,679) | $ (146,383) | $ 6,181 | $ 9,946 | $ 25,061 | $ 6,653 | $ (105,195) | $ (953,520)
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) |  |  |  |  |  |  |  |  |  |  | $ 86,900

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