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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2017
USD ($)
Aug. 31, 2005
USD ($)
Dec. 31, 2017
USD ($)
claim
defendant
case
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 08, 2016
USD ($)
Commitments and Contingencies            
Subcontractor settlement     $ 0 $ 0 $ 4,220  
loss contingency, Brazilian labor claims            
Commitments and Contingencies            
Liabilities for asserted and unasserted claims     $ 9,600 $ 7,900    
Customer Disputes [Member]            
Commitments and Contingencies            
Subcontractor settlement $ 5,400          
Other            
Commitments and Contingencies            
Loss Contingency, Number of Defendants | defendant     90      
Number of pending claims | claim     17,144      
Loss Contingency, Claims Dismissed, Number | case     27,943      
Other | Minimum            
Commitments and Contingencies            
Loss Contingency, Damages Sought, Value     $ 20,000      
Other | Maximum            
Commitments and Contingencies            
Loss Contingency, Damages Sought, Value     $ 25,000      
Pending Litigation, Active Or In Extremis Docket | Other            
Commitments and Contingencies            
Number of pending claims | claim     30      
Sao Paulo State Revenue Authority | Value-Added Tax Assessments January 2004 To May 2005            
Commitments and Contingencies            
Loss Contingency, Damages Sought, Principal Amount     $ 2,000      
Estimated claims or assessment, additional amount     $ 24,000      
Sao Paulo State Revenue Authority | Value-Added Tax Assessments January 2002 To December 2003            
Commitments and Contingencies            
Loss Contingency, Damages Sought, Principal Amount   $ 1,800        
Estimated claims or assessment, additional amount   5,800        
Loss Contingency, Damages Sought, Value   $ 7,600        
New York County as managed by the New York Supreme Court | Other            
Commitments and Contingencies            
Number of pending claims | case     16,742      
New York County as managed by the New York Supreme Court | Pending And Future Litigation, Deferred Or Inactive Docket | Other            
Commitments and Contingencies            
Number of pending claims | claim     16,712      
New York State Supreme Court, Counties Excluding New York County [Member] | Other            
Commitments and Contingencies            
Number of pending claims | case     110      
Courts Located In States Other Than New York | Other            
Commitments and Contingencies            
Number of pending claims | case     292      
Lima Refinery Litigation [Member]            
Commitments and Contingencies            
Loss Contingency, Property Damages           $ 106,000
Loss Contingency, Lost Profits and Business Interruption Damages           $ 289,000
Consolidated Revenue, Net [Member] | Subsidiary Concentration Risk [Member]            
Commitments and Contingencies            
Concentration Risk, Percentage     2.00% 2.00% 2.00%