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Income Taxes - Tax Attributes and Valuation Allowances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Loss Carryforwards      
Balance at beginning of period, Valuation allowance $ (607) $ (735) $ (1,027)
Additions to valuation allowance (742) (88)  
Reductions to valuation allowance 172 216 292
Balance at end of period, Valuation allowance (1,177) (607) $ (735)
Deferred tax assets net 213,543 228,449  
ECOTEC      
Operating Loss Carryforwards      
Balance at end of period, Valuation allowance (700)    
Domestic      
Operating Loss Carryforwards      
Operating loss carryforwards 727,500    
Operating loss carryforward not subject to expiration 629,300    
Tax credit carryforward 3,000    
Interest expense limitation carryforwards 135,300    
State      
Operating Loss Carryforwards      
Operating loss carryforwards 283,900    
Operating loss carryforward not subject to expiration 167,200    
NOL valuation allowance 500 $ 600  
Interest expense limitation carryforwards $ 43,800