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Significant Accounting Policies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Significant Accounting Policies [Line Items]      
Impairment of assets $ 1,206,284,000 $ 0 $ 20,000,000 [1]
Impairment of assets $ 1,206,284,000 $ 0 $ 20,000,000
Withholding tax on amounts repatriated 5.00%    
Petrobas America Inc      
Significant Accounting Policies [Line Items]      
Percentage of acquired entity reported 100.00%    
Percentage of acquired entity noncontrolling interest reported 20.00%    
Performance Based Restricted Stock      
Significant Accounting Policies [Line Items]      
Stock-based compensation, vesting period 3 years    
Minimum      
Significant Accounting Policies [Line Items]      
Equity method investment, ownership percentage 20.00%    
Minimum | Stock Options      
Significant Accounting Policies [Line Items]      
Stock-based compensation, vesting period 2 years    
Maximum      
Significant Accounting Policies [Line Items]      
Equity method investment, ownership percentage 50.00%    
Maximum | Stock Options      
Significant Accounting Policies [Line Items]      
Stock-based compensation, vesting period 3 years    
[1] Reclassified to conform with current presentation