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Financial Instruments - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Feb. 10, 2021
Senior Notes | 4¾% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate (in percentage) 4.75%  
Senior Notes | 3¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate (in percentage) 3.25%  
Senior Notes | 4⅛% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate (in percentage) 4.125%  
Senior Notes | 2¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate (in percentage) 2.25%  
Senior Notes | 1.4% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate (in percentage) 1.40% 1.40%
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 190,131  
Carrying Amount | Bank debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 597,030  
Carrying Amount | Senior Notes | 4¾% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 300,000  
Carrying Amount | Senior Notes | 3¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 763,945  
Carrying Amount | Senior Notes | 4⅛% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 600,000  
Carrying Amount | Senior Notes | 2¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 587,650  
Carrying Amount | Senior Notes | 1.4% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 500,000  
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 190,131  
Fair Value | Bank debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 597,030  
Fair Value | Senior Notes | 4¾% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 304,950  
Fair Value | Senior Notes | 3¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 770,515  
Fair Value | Senior Notes | 4⅛% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 616,380  
Fair Value | Senior Notes | 2¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 590,412  
Fair Value | Senior Notes | 1.4% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt $ 489,400