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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2021
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, 2021:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$270,567 $270,567 
Liabilities:  
Bank debt$1,346,003 $1,346,003 
4¾% Notes300,000 304,140 
3¼% Notes753,285 760,291 
4⅛% Notes599,172 616,500 
2¼% Notes579,450 584,607 
1.4% Notes499,758 492,000