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Revenue From Contracts with Customers - Performance Obligation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Total Revenues $ 280,718 $ 480,390 $ 599,364 $ 955,384  
Graphite Electrodes - Three-to-five-year take-or-pay contracts          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Total Revenues 245,010 $ 377,605 521,389 $ 773,645  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount         $ 1,251,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 1,210,000   $ 1,210,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 1,144,000   $ 1,144,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 49,000   $ 49,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period      
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 950,000   $ 950,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year   1 year    
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 430,000   $ 430,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 6 months   6 months    
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 1,100,000   $ 1,100,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year   1 year    
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 580,000   $ 580,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 6 months   6 months