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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, All Other Investments [Abstract]  
Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments The following table summarizes the carrying amounts and estimated fair values of our other financial instruments at September 30, 2023:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$307,124 $307,124 
Liabilities:  
Bank debt$1,843,502 $1,843,502 
3¼% Senior Notes688,155 671,385 
4⅛% Senior Notes599,407 536,790 
2¼% Senior Notes529,350 451,149 
1.4% Senior Secured Notes
499,862 443,505