REGULATORY ASSETS & REGULATORY LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2011

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets

Regulatory Assets consisted of the following items (in thousands):

	September 30, 2011		December 31, 2010
Environmental Remediation Costs:
Expended - Net	$	48,199	$	39,056
Liability for Future Expenditures	81,357		87,393
Income Taxes - Flowthrough Depreciation	40		774
Deferred Asset Retirement Obligation Costs	24,781		24,247
Deferred Pension and Other Postretirement Benefit Costs	68,733		69,017
Deferred Gas Costs - Net	4,750		—
Conservation Incentive Program Receivable	4,805		12,291
Societal Benefit Costs Receivable	6,919		4,216
Premium for Early Retirement of Debt	578		699
Deferred Interest Rate Contracts	7,825		3,150
Other Regulatory Assets	9,645		7,570
Total Regulatory Assets	$	257,632	$	248,413

Schedule of Regulatory Liabilities

Regulatory Liabilities consisted of the following items (in thousands):

	September 30, 2011		December 31, 2010
Excess Plant Removal Costs	$	47,498	$	48,409
Deferred Revenues - Net	—		20,179
Other Regulatory Liabilities	2,139		660
Total Regulatory Liabilities	$	49,637	$	69,248