Debt And Other Financing Arrangements (Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt, Total	$ 719,016	$ 718,886
Less current maturities	0	(550)
Long-term debt	719,016	718,336
Promissory Note, 2.63%, Due 2016 [Member]
Debt Instrument [Line Items]
Promissory note	550	550
Maturity date	2016
7.25% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Senior Notes	425,000	425,000
Six Point Seven Zero Percent Senior Debentures Due Two Thousand Thirty Four [Member]
Debt Instrument [Line Items]
Senior Notes	300,000	300,000
Discount	(6,534)	(6,664)
Senior notes after fair market value adjustment and discount	$ 293,466	$ 293,336