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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Income tax benefit $ 12,011 $ 0 $ 12,929
Net operating loss carryforwards with expiration 409,000    
Net operating loss carryforwards with no expiration 144,500    
Increase (decrease) in deferred tax valuation allowance 37,800 23,900  
Federal      
Income Taxes      
Operating Loss Carryforwards 658,800 564,300  
State      
Income Taxes      
Operating Loss Carryforwards $ 257,100 $ 170,500