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Financial Instruments (Tables)
 6 Months Ended
Jun. 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 June 30, 2021:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$164,821 $164,821 
Liabilities:  
Bank debt$642,991 $642,991 
4¾% Notes300,000 304,890 
3¼% Notes770,835 777,850 
4⅛% Notes600,000 622,500 
2¼% Notes592,950 597,397 
1.4% Notes500,000 495,000