Taxes Other Than Income Taxes (Components Of Taxes Other Than Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Taxes Other Than Income Taxes [Line Items]
Taxes other than income before discontinued operations	$ 13,475	$ 13,446	$ 26,151	$ 27,211
Less discontinued operations	882	2,695	3,468	5,409
Total taxes other than income	12,593	10,751	22,683	21,802
Property [Member]
Taxes Other Than Income Taxes [Line Items]
Taxes other than income before discontinued operations	6,528	6,781	13,285	13,852
Capital Stock [Member]
Taxes Other Than Income Taxes [Line Items]
Taxes other than income before discontinued operations	870	892	1,648	1,773
Gross Receipts, Excise And Franchise [Member]
Taxes Other Than Income Taxes [Line Items]
Taxes other than income before discontinued operations	2,911	2,620	4,475	4,937
Payroll [Member]
Taxes Other Than Income Taxes [Line Items]
Taxes other than income before discontinued operations	1,697	1,621	3,964	3,940
Other [Member]
Taxes Other Than Income Taxes [Line Items]
Taxes other than income before discontinued operations	$ 1,469	$ 1,532	$ 2,779	$ 2,709