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Income Taxes - Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating loss carryforwards disclosures    
Net deferred tax asset $ 51,260 $ 63,342
Domestic    
Operating loss carryforwards disclosures    
Net operating loss carryforwards 219,300  
Net operating loss carryforwards, Indefinite carryforward period 6,900  
State and local    
Operating loss carryforwards disclosures    
Net operating loss carryforwards 122,700  
Net deferred tax asset $ 7,700