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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
2 Months Ended 6 Months Ended
Jul. 25, 2019
Feb. 04, 2019
Feb. 23, 2017
Oct. 31, 2016
Jun. 30, 2019
Dec. 31, 2018
Nov. 06, 2014
Loss Contingencies [Line Items]              
Damages incurred   $ 1,250 $ 250        
Common stock, shares issued (in shares)         46,480,105 45,391,397  
Global Marine Dispute              
Loss Contingencies [Line Items]              
Damages incurred       $ 38,200      
Invoices rejected         $ 17,000    
Loss contingency, damages paid         8,100    
Loss contingency accrual         $ 8,900    
Global Marine Dispute | Liquidated Damages              
Loss Contingencies [Line Items]              
Damages incurred       $ 1,200      
DBMG              
Loss Contingencies [Line Items]              
Common stock, shares issued (in shares)             721,000
Subsequent Event | Global Marine Dispute              
Loss Contingencies [Line Items]              
Loss contingency, damages paid $ 3,500