v2.4.0.8

Reconciliation of Segment Information, Total Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Assets:
Assets	$ 12,752,928	$ 12,670,909	$ 12,597,896
Items excluded from segment assets:
Recoverable Income Taxes	1,930	0
Total Reportable Business Segments
Assets:
Assets	11,771,465		11,416,441
Coal
Assets:
Assets	5,600,934		5,445,502
Gas
Assets:
Assets	6,170,531		5,970,939
All Other Segments [Member]
Assets:
Assets	363,819		360,673
Excludes Gas Segment [Member]
Items excluded from segment assets:
Cash and Other Investments	45,905		186,611
Intersegment Elimination [Member]
Assets:
Assets	617,644		820,782
Items excluded from segment assets:
Recoverable Income Taxes	1,930		0
Deferred Tax Assets	531,707		588,722
Bond Issuance Costs	$ 38,102		$ 45,449

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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