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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]              
Income tax provision         $ 119,383 $ 125,749 $ 109,106
Actual income tax rates         47.30% 27.90% 27.60%
Impairment loss on goodwill, identifiable intangible assets, and other long-lived assets $ 0 $ 0 $ 232,750 $ 0 $ 232,750 $ 0 $ 907
Income tax expense, foreign minimum tax         100 100 $ 600
Cash and cash equivalents 902,867       902,867 358,818  
Deferred tax liabilities, net 29,436       29,436 71,746  
Valuation allowance for deferred tax assets 3,856       3,856 3,463  
Other Assets              
Operating Loss Carryforwards [Line Items]              
Deferred tax liabilities, net 7,400       7,400 3,400  
Other Long-Term Obligations              
Operating Loss Carryforwards [Line Items]              
Deferred tax liabilities, net 36,800       36,800 $ 75,200  
Non-US [Member] | Subsidiaries [Member]              
Operating Loss Carryforwards [Line Items]              
Undistributed earnings of foreign subsidiaries 89,600       89,600    
Cash and cash equivalents $ 100,800       $ 100,800