Debt, Financing Arrangements and Leases (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Long-term debt

At December 31, 2015 and 2014, long-term debt issues were outstanding as follows (in thousands):

	2015			2014
Debentures:
7.08% due 2026	$	7,500		$	7,500
7.25% due 2026	200,000			200,000
Total debentures	207,500			207,500
Notes:
6.4% due 2016	200,000			200,000
6.05% due 2018	250,000			250,000
5.4% due 2041	375,000			375,000
4.45% due 2042	400,000			400,000
Total notes	1,225,000			1,225,000
Total long-term debt issues	1,432,500			1,432,500
Unamortized debt issuance costs	(9,069		)	(9,803		)
Unamortized debt premium and discount, net	(3,857		)	(4,005		)
Total long-term debt	$	1,419,574		$	1,418,692

Maturities of long-term debt

Aggregate minimum maturities (face value) applicable to long-term debt outstanding at December 31, 2015, for the next five years, are as follows (in thousands):

2016:     6.4% Notes	$200,000
2018:     6.05% Notes	$250,000

Future minimum lease payments

The future minimum lease payments under our various operating leases are as follows (in thousands):

2016	$	13,552
2017	13,485
2018	13,480
2019	11,074
2020	11,093
Thereafter	5,037
Total net minimum obligations	$	67,721