Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Long-Term Debt

	June 30,			December 31,
	2019			2018
	(Dollars in Thousands)
4.25% Senior Notes, due 2024	$	396,697		$	396,398
7% Debentures, due 2025		124,319			124,272
3.450% Senior Notes, due 2027		297,098			296,939
3.500% Senior Notes, due 2027		495,011			494,765
6.25% Senior Notes, due 2037		228,126			228,094
4.250% Senior Notes, due 2047		591,626			591,541
Floating Rate Senior Notes, due 2019, interest rate of 2.89%    and 3.29% at June 30, 2019 and December 31, 2018,    respectively		299,633			299,260
Floating Rate Senior Notes, due 2020, interest rate of 3.17% and    3.30% at June 30, 2019 and December 31, 2018, respectively		299,323			298,956
Trade Receivable Facility, interest rate of 3.17% and 3.07% at    June 30, 2019 and December 31, 2018, respectively		385,000			390,000
Other notes		228			256
Total debt		3,117,061			3,120,481
Less: Current maturities of long-term debt and short-term    facilities		(385,043	)		(390,042	)
Long-term debt	$	2,732,018		$	2,730,439