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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2022
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, 2022:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$243,609 $243,609 
Liabilities:  
Bank debt$1,563,649 $1,563,649 
3¼% Senior Notes636,740 601,083 
4⅛% Senior Notes599,287 532,200 
2¼% Senior Notes489,800 394,632 
1.4% Senior Secured Notes499,811 427,000