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Financial Instruments (Tables)
 6 Months Ended
Jun. 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 June 30, 2022:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$247,843 $247,843 
Liabilities:  
Bank debt$1,736,364 $1,736,364 
3¼% Senior Notes679,510 643,496 
4⅛% Senior Notes599,258 538,020 
2¼% Senior Notes522,700 412,828 
1.4% Senior Secured Notes499,797 447,200