Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details)

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Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 01, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill impairment charge   $ 260,000 $ 0 $ 0  
Unrealized Gain (Loss) on Securities   545 $ 944 $ 346  
Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill, Gross         $ 973,578
Goodwill implied fair value         $ 717,738
Goodwill impairment charge $ 260,000        
Estimate of Fair Value Measurement | Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill implied fair value   717,738      
Estimate of Fair Value Measurement | Nonrecurring | Quoted Prices in Active Markets (Level 1)          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill implied fair value   0      
Estimate of Fair Value Measurement | Nonrecurring | Significant Other Observable Inputs (Level 2)          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill implied fair value   717,738      
Estimate of Fair Value Measurement | Nonrecurring | Significant Unobservable Inputs (Level 3)          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill implied fair value   0      
Change Measurement During Period | Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill implied fair value   $ (260,000)