REGULATORY ASSETS & REGULATORY LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2013

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets

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

	June 30, 2013		December 31, 2012
Environmental Remediation Costs:
Expended - Net	$	30,387	$	37,892
Liability for Future Expenditures	110,148		107,410
Deferred Asset Retirement Obligation Costs	30,594		30,199
Deferred Pension and Other Postretirement Benefit Costs	95,897		95,897
Conservation Incentive Program Receivable	11,824		31,686
Societal Benefit Costs Receivable	12,502		12,801
Premium for Early Retirement of Debt	997		1,075
Deferred Interest Rate Contracts	5,164		7,761
Energy Efficiency Tracker	11,949		12,306
Pipeline Supplier Service Charges	7,938		8,771
Other Regulatory Assets	9,006		6,858
Total Regulatory Assets	$	326,406	$	352,656

Schedule of Regulatory Liabilities

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

	June 30, 2013		December 31, 2012
Excess Plant Removal Costs	$	42,673	$	45,593
Deferred Revenues - Net	14,693		10,924
Other Regulatory Liabilities	3,249		—
Total Regulatory Liabilities	$	60,615	$	56,517