Taxes Other Than Income Taxes (Components Of Taxes Other Than Income Taxes) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Taxes Other Than Income Taxes [Line Items]
Total taxes other than income	$ 14,164	$ 14,182	$ 41,375	$ 39,985
Taxes other than income taxes for discontinued operation	2,840	2,740	8,249	7,824
Property [Member]
Taxes Other Than Income Taxes [Line Items]
Total taxes other than income	6,930	7,376	20,782	20,466
Capital Stock [Member]
Taxes Other Than Income Taxes [Line Items]
Total taxes other than income	895	850	2,668	2,641
Gross Receipts, Excise And Franchise [Member]
Taxes Other Than Income Taxes [Line Items]
Total taxes other than income	2,881	3,111	7,818	7,790
Payroll [Member]
Taxes Other Than Income Taxes [Line Items]
Total taxes other than income	1,583	1,519	5,523	5,267
Other [Member]
Taxes Other Than Income Taxes [Line Items]
Total taxes other than income	$ 1,875	$ 1,326	$ 4,584	$ 3,821