Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Long-Term Debt

	September 30,			December 31,			September 30,
	2015			2014			2014
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	299,305		$	299,123		$	299,063
7% Debentures, due 2025		124,524			124,500			124,493
6.25% Senior Notes, due 2037		228,213			228,184			228,175
4.25 % Senior Notes, due 2024		395,614			395,309			395,211
Floating Rate Notes, due 2017, interest rate of 1.38%,      1.33% and 1.34% at September 30, 2015, December 31, 2014      and September 30, 2014, respectively		299,251			298,869			298,760
Term Loan Facility, due 2018, interest rate of 1.72% at September 30,      2015; 1.67% at December 31, 2014; and 1.65% at September 30, 2014		227,121			236,258			239,304
Trade Receivable Facility, interest rate of 0.90% and 0.76% at      September 30, 3015 and 2014, respectively		130,000			—			30,000
Other notes		1,124			3,152			3,269
Total debt		1,705,152			1,585,395			1,618,275
Less: Current maturities		(147,536	)		(14,336	)		(14,331	)
Long-term debt	$	1,557,616		$	1,571,059		$	1,603,944