Annual report pursuant to Section 13 and 15(d)

INVESTMENT IN AL MASANE AL KOBRA MINING COMPANY (AMAK) (Details)

v3.3.1.900
INVESTMENT IN AL MASANE AL KOBRA MINING COMPANY (AMAK) (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
SAR / $
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
May. 27, 2013
Jan. 31, 2013
SAR / shares
shares
Investment in Al Masane Al Kobra Mining Company Amak [Line Items]              
Exchange rate | SAR / $   3.75          
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]              
Equity in earnings (loss) of AMAK   $ (5,325,000) $ (1,072,000) $ 4,703,000      
AMAK [Member]              
Investment in Al Masane Al Kobra Mining Company Amak [Line Items]              
Investment in AMAK   $ 47,700,000 53,000,000        
Exchange rate | SAR / $   3.75          
Results of Operations [Abstract]              
Sales   $ 50,744,000 63,300,000 104,990,000      
Gross profit   (10,437,000) 3,624,000 21,881,000      
General, administrative and other expenses   8,796,000 10,487,000 12,360,000      
Net income (loss)   (19,233,000) (6,863,000) 9,521,000      
Depreciation and amortization expense   23,200,000 23,700,000 24,400,000      
Net Income Loss Before Depreciation and Amortization   4,016,000 16,845,000 33,878,000      
Financial Position [Abstract]              
Current assets   26,078,000 14,893,000        
Noncurrent assets   259,527,000 268,473,000        
Total assets   285,605,000 283,366,000        
Current liabilities   22,740,000 23,034,000        
Long term liabilities   89,364,000 67,598,000        
Shareholders' equity   173,501,000 192,734,000        
Total liabilities and equity   285,605,000 283,366,000        
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]              
AMAK Net Income (Loss)   (19,233,000) (6,863,000) 9,521,000      
Zakat tax applicable to Saudi Arabian shareholders only   303,000 0 0      
AMAK Net Income (Loss) before Saudi Arabian shareholders' portion of Zakat   (18,930,000) (6,863,000) 9,521,000      
Company's share of earnings (loss) reported by AMAK (35.25%)   (6,672,000) (2,419,000) 3,356,000      
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK   1,347,000 1,347,000 1,347,000      
Equity in earnings (loss) of AMAK   (5,325,000) (1,072,000) 4,703,000      
Gain upon formation of AMAK   $ 16,200,000          
Percentage interest acquire by other investors in AMAK         10.00%    
Shares purchased under equity method investments (in shares) | shares 937,500           937,500
Share price (in dollars per share) | (per share) $ 8.00           SAR 30
Payments to acquire equity method investments $ 7,500,000            
Percentage investment in AMAK   35.25%       35.00%  
Increase in the entity's share in net assets of AMAK       4,000,000      
Impairment charges on investment in AMAK   $ 0 $ 0 $ 0