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Financial Instruments - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
4¾% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Senior note interest rate (in percentage) 4.75%
3¼% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Senior note interest rate (in percentage) 3.25%
4⅛% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Senior note interest rate (in percentage) 4.125%
2¼% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Senior note interest rate (in percentage) 2.25%
Carrying Amount  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash and cash equivalents $ 193,759
Derivative instruments (accrued and other liabilities) 6,588
Carrying Amount | Bank debt  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 1,185,825
Carrying Amount | 4¾% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 300,000
Carrying Amount | 3¼% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 762,223
Carrying Amount | 4⅛% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 599,062
Carrying Amount | 2¼% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 586,325
Fair Value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash and cash equivalents 193,759
Derivative instruments (accrued and other liabilities) 6,588
Fair Value | Bank debt  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 1,185,825
Fair Value | 4¾% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 305,250
Fair Value | 3¼% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 772,589
Fair Value | 4⅛% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt 613,500
Fair Value | 2¼% Senior Notes  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Bank debt $ 573,133