Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Details)

v3.6.0.2
COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands, SAR in Millions
 12 Months Ended
Jul. 17, 2016
shares
Dec. 31, 2016
USD ($)
Railcar
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
SAR
Railcar
Dec. 31, 2015
SAR
Oct. 24, 2010
USD ($)
Oct. 24, 2010
SAR
Loss Contingencies [Line Items]                
Expenses for environmental monitoring, compliance, and improvements   $ 622 $ 604 $ 414        
Operating Leases, Future Minimum Payments Receivable [Abstract]                
2017   3,595            
2018   3,393            
2019   3,341            
2020   3,250            
2021   3,120            
Thereafter   4,675            
Total   21,374            
Operating Leased Assets [Line Items]                
Operating lease, rental expense   $ 4,200 4,200 $ 2,500        
AMAK [Member]                
Guarantor Obligations [Line Items]                
Contribution of shares to be issued upon reaching goals (in shares) | shares 250,000              
Other Shareholders [Member]                
Guarantor Obligations [Line Items]                
Contribution of shares to be issued upon reaching goals (in shares) | shares 250,000              
Railcars [Member]                
Operating Leased Assets [Line Items]                
Number Of Railcars | Railcar   340     340      
Operating lease expiration date   Dec. 31, 2026            
Total commitments under operating leases   $ 21,200            
Operating Lease Period   10 years            
Office Space in Sugar Land, TX [Member]                
Operating Leased Assets [Line Items]                
Operating lease expiration date   Dec. 31, 2018            
Total commitments under operating leases   $ 100            
Other Equipment [Member]                
Operating Leased Assets [Line Items]                
Operating lease expiration date   Dec. 31, 2020            
Total commitments under operating leases   $ 100            
Pending Litigation [Member]                
Loss Contingencies [Line Items]                
Accrued recorded value   1,000            
Saudi Industrial Development Fund Limited Guarantee [Member]                
Guarantor Obligations [Line Items]                
Principal amount of loan guaranteed             $ 88,000 SAR 330.0
Amount of maximum exposure   $ 82,700 $ 82,700   SAR 310.0 SAR 310.0 $ 36,100 SAR 135.3
Saudi Industrial Development Fund Limited Guarantee [Member] | Maximum [Member]                
Guarantor Obligations [Line Items]                
Loan guarantee             41.00% 41.00%