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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$191,082  $191,082  
Liabilities:  
Bank debt$1,296,534  $1,296,534  
4¾% Senior Notes300,000  303,813  
3¼% Senior Notes728,520  734,592  
4⅛% Senior Notes599,035  594,750  
2¼% Senior Notes560,400  540,450  
Derivative instruments (accrued and other liabilities)7,259  7,259