Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK - Additional Information (Details)

v3.19.1
INVESTMENT IN AMAK - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
ر.س / $
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Proceeds from AMAK Share Repurchase $ 440 $ 0    
Treasury Stock        
Schedule of Equity Method Investments [Line Items]        
Number of stock exchanged (in shares) | shares   65,000    
AMAK        
Schedule of Equity Method Investments [Line Items]        
Proceeds from AMAK Share Repurchase $ 400      
Number of stock exchanged (in shares) | shares   24,489    
Percentage of Ownership 33.40% 33.41%   33.44%
Investment in equity method investment $ 37,400   $ 38,700  
Exchange rate | ر.س / $ 3.75      
Amount receivable for unreimbursed travel expenses $ 54   $ 67  
Parent | AMAK        
Schedule of Equity Method Investments [Line Items]        
Percentage of Ownership 33.40%