Debt, Financing Arrangements and Leases (Tables)

12 Months Ended

Dec. 31, 2012

Debt Financing Arrangements And Leases [Abstract]

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			2012		2011
Debentures:
	7.08% due 2026		$	7,500	$	7,500
	7.25% due 2026			200,000		200,000
		Total debentures		207,500		207,500
Notes:
	8.875% due 2012			-		325,000
	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		-
		Total notes		1,225,000		1,150,000
Total long-term debt issues				1,432,500		1,357,500
	Unamortized debt premium and discount			(4,177)		(3,103)
	Current maturities			-		(325,000)
Total long-term debt, less current maturities			$	1,428,323	$	1,029,397

ScheduleOfMaturitiesOfLongTermDebtTableTextBlock

2016: 6.4% Notes $ 200,000

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2013	$	9,658
2014		9,654
2015		9,524
2016		9,524
2017		9,523
Thereafter		30,758
Total net minimum obligations	$	78,641