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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Increase in valuation allowance on deferred tax assets related to net operating loss carryforwards $ 139,100    
Increase in income tax expense   $ 2,700  
Capital loss carryforwards 149,608 7,801  
Valuation allowance 152,295 13,147  
Tax effect related to interest rate swap agreements 5,964 4,147  
Unrecognized tax benefits 1,100 1,061 $ 0
Unrecognized tax benefits that affect our effective tax rate 0    
Indefinite Carryforward      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 8,000    
Capital Loss Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards $ 598,400    
Earliest Tax Year      
Operating Loss Carryforwards [Line Items]      
Open tax year 2017    
Earliest Tax Year | Capital Loss Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards, expiration dates Dec. 31, 2021    
Latest Tax Year | Capital Loss Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards, expiration dates Dec. 31, 2025    
TPHS and Nutrisystem      
Operating Loss Carryforwards [Line Items]      
Capital loss carryforwards $ 149,600    
International      
Operating Loss Carryforwards [Line Items]      
Operating loss carry forwards valuation allowance 2,400    
Operating loss carryforwards 8,200    
State      
Operating Loss Carryforwards [Line Items]      
Increase in valuation allowance on deferred tax assets related to net operating loss carryforwards (2,700) 1,800  
Reduction in deferred tax asset related to income tax credits   $ 900  
Operating loss carry forwards valuation allowance 300    
Operating loss carryforwards $ 159,000    
State | Earliest Tax Year      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, expiration dates Dec. 31, 2021    
State | Latest Tax Year      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, expiration dates Dec. 31, 2036