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Long-term Investments (Details Narrative) - USD ($) $ in Thousands			6 Months Ended
	May 03, 2019	Jan. 11, 2019	Jun. 30, 2019	Jun. 30, 2018	Apr. 30, 2019	Dec. 31, 2018
Cash consideration paid for acquisition of minority interest			$ 34,100	$ 6,000
Long-term investments			$ 44,978
ESMetals [Member]
Equity method investment, ownership percentage					70.00%
Saint-Gobain Joint Venture Agreement [Member] \| Vidrio Andino Holdings S.A.S [Member]
Minority ownership interest		25.80%
Purchase price for acquiring minority interest		$ 45,000
Cash consideration paid for acquisition of minority interest	$ 34,100
Recorded investments in relation to acquisition	45,000
Recorded current liabilities in relation to acquisition	$ 10,900
Saint-Gobain Joint Venture Agreement [Member] \| Vidrio Andino Holdings S.A.S [Member] \| Land [Member]
Recorded current liabilities in relation to acquisition		$ 10,900