Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018:

	Carrying Amount		Fair Value
	(Dollars in thousands)
Assets:
Cash and cash equivalents	$	181,220	$	181,220
Liabilities:
Bank debt	$	1,617,851	$	1,617,851
5½% Senior Notes	300,000		304,524
4¾% Senior Notes	300,000		286,698
3¼% Senior Notes	759,460		770,708