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Correction of Immaterial Errors Correction of Immaterial Errors (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
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