Correction of Immaterial Errors Correction of Immaterial Errors (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net (loss) earnings	$ (105,195)	$ (953,520)	$ 96,422
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net (loss) earnings		$ 86,900