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INVESTMENT IN AL MASANE AL KOBRA MINING COMPANY (AMAK) (Details)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||||||||
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Jun. 30, 2014
USD ($)
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Jun. 30, 2013
USD ($)
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Jun. 30, 2014
USD ($)
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Jun. 30, 2013
USD ($)
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Dec. 31, 2013
USD ($)
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Jun. 30, 2014
AMAK [Member]
USD ($)
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Jun. 30, 2013
AMAK [Member]
USD ($)
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Jun. 30, 2014
AMAK [Member]
USD ($)
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Jun. 30, 2013
AMAK [Member]
USD ($)
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Dec. 31, 2013
AMAK [Member]
USD ($)
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Jun. 30, 2014
AMAK [Member]
USD ($)
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Jun. 30, 2014
AMAK [Member]
SAR
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Dec. 31, 2013
AMAK [Member]
USD ($)
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| Investment in Al Masane Al Kobra Mining Company Amak [Line Items] | |||||||||||||
| Investment in AMAK | $ 53,800,000 | $ 54,100,000 | |||||||||||
| Exchange rate | 3.75 | ||||||||||||
| Outstanding advance to AMAK | 0 | 0 | 536,000 | 536,000 | |||||||||
| Schedule of Equity Method Investments [Line Items] | |||||||||||||
| Percentage investment in AMAK (in hundredths) | 35.00% | 35.00% | |||||||||||
| Company's share of income (loss) reported by AMAK | (331,000) | 399,000 | (1,018,000) | 3,026,000 | |||||||||
| Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK | 337,000 | 337,000 | 674,000 | 674,000 | |||||||||
| Gain from additional equity issued by AMAK | 0 | 3,996,000 | 0 | 3,996,000 | |||||||||
| Equity in income (loss) of AMAK | 6,000 | 4,732,000 | (344,000) | 7,696,000 | |||||||||
| Results of Operations [Abstract] | |||||||||||||
| Sales | 30,431,000 | 15,333,000 | 30,698,000 | 46,495,000 | |||||||||
| Gross Profit | 4,045,000 | 8,128,000 | 4,684,000 | 18,034,000 | |||||||||
| General, administrative and other expenses | 4,982,000 | 7,029,000 | 7,570,000 | 9,815,000 | |||||||||
| Net Income (loss) | (937,000) | 1,099,000 | (2,886,000) | 8,219,000 | |||||||||
| Financial Position [Abstract] | |||||||||||||
| Current assets | 26,558,000 | 26,558,000 | 32,923,000 | ||||||||||
| Noncurrent assets | 263,961,000 | 263,961,000 | 264,997,000 | ||||||||||
| Total assets | 290,519,000 | 290,519,000 | 297,920,000 | ||||||||||
| Current liabilities | 16,109,000 | 16,109,000 | 22,497,000 | ||||||||||
| Long term liabilities | 77,700,000 | 77,700,000 | 75,826,000 | ||||||||||
| Shareholders' equity | 196,710,000 | 196,710,000 | 199,597,000 | ||||||||||
| Total liabilities and Shareholders' equity | $ 290,519,000 | $ 290,519,000 | $ 297,920,000 | ||||||||||