Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.20.4
Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2020
Operating Loss Carryforwards [Line Items]                        
Income tax (benefit) expense $ 0 $ 0 $ 0 $ 7,290 $ 315,815 $ (144,047) $ (179,331) $ 0 $ 7,290 $ (7,563) $ (69)  
Foreign tax credit carryforwards 523       943       523 943 2,009  
Valuation allowance for deferred tax assets (985,528)       $ (647,575)       (985,528) (647,575) (211,987)  
Valuation allowance increase (decrease)                 $ 338,000 $ 439,500 $ (86,800)  
Testing period                 3 years      
Maximum percentage of company's securities allowed to be owned by third party                       4.90%
Uncertain tax positions, liability 3,800               $ 3,800      
Federal                        
Operating Loss Carryforwards [Line Items]                        
Net operating loss carryforward 1,900,000               1,900,000      
State                        
Operating Loss Carryforwards [Line Items]                        
Operating loss carryforwards, subject to expiration $ 441,000               $ 441,000