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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2020:
Carrying
Amount		Fair
Value
 (Dollars in thousands)
Assets:  
Cash and cash equivalents$614,846  $614,846  
Liabilities:  
Bank debt$856,239  $856,239  
4¾% Notes300,000  289,500  
3¼% Notes713,490  699,263  
4⅛% Notes599,009  553,500  
2¼% Notes548,839  489,015  
Derivative instruments (accrued and other liabilities)7,396  7,396