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Commitments and Contingencies (Details) - USD ($) $ in Millions	2 Months Ended	9 Months Ended
	Oct. 31, 2016	Sep. 30, 2018	Dec. 31, 2017	Nov. 06, 2014
Loss Contingencies [Line Items]
Common stock, shares issued (in shares)		45,188,169	44,570,004
Global Marine Dispute
Loss Contingencies [Line Items]
Damages incurred (in excess of)	$ 38.2
Invoices rejected		$ 17.0
Loss contingency, damages paid		8.1
Loss contingency accrual		$ 8.9
Global Marine Dispute | Liquidated Damages
Loss Contingencies [Line Items]
Damages incurred (in excess of)	$ 1.2
DBMG
Loss Contingencies [Line Items]
Common stock, shares issued (in shares)				721,000

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