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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Schedule of Equity Method Investments [Line Items]        
Glencore beneficial ownership 42.90%      
Glencore economic ownership 47.20%      
Allowance for doubtful accounts receivable $ 1,000 $ 1,000    
Operating income (loss) (59,000) 97,200 [1] $ (227,900)  
Other operating expense, net $ (400) (2,100) [1] (3,900)  
Baise Haohi Carbon Co Ltd [Member]        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage, equity method 40.00%      
Building and Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 10 years      
Building and Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 45 years      
Machinery and Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 5 years      
Machinery and Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 35 years      
Technology and Software [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 3 years      
Technology and Software [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 7 years      
Accounting Standards Update 2016-02 [Member] | Minimum [Member] | Forecast [Member]        
Schedule of Equity Method Investments [Line Items]        
Operating lease, right-of-use asset       $ 20,000
Operating lease, liability       18,000
Accounting Standards Update 2016-02 [Member] | Maximum [Member] | Forecast [Member]        
Schedule of Equity Method Investments [Line Items]        
Operating lease, right-of-use asset       26,000
Operating lease, liability       $ 26,000
Restatement Adjustment [Member] | Accounting Standards Update 2017-07 [Member]        
Schedule of Equity Method Investments [Line Items]        
Operating income (loss)   (3,300) (6,200)  
Other operating expense, net   $ 3,300 $ 6,200  
[1] As adjusted due to the adoption of ASU 2017-07 Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost