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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2021:
Carrying
Amount
Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$190,131 $190,131 
Liabilities:  
Bank debt$597,030 $597,030 
4¾% Notes300,000 304,950 
3¼% Notes763,945 770,515 
4⅛% Notes600,000 616,380 
2¼% Notes587,650 590,412 
1.4% Notes500,000 489,400