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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2022:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$259,564 $259,564 
Liabilities:  
Bank debt$1,558,014 $1,558,014 
3¼% Senior Notes723,190 721,671 
4⅛% Senior Notes599,229 575,280 
2¼% Senior Notes556,300 507,624 
1.4% Senior Secured Notes499,784 456,550