REGULATORY ASSETS AND LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2014

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets

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

	March 31, 2014		December 31, 2013
Environmental Remediation Costs:
Expended - Net	$	26,590	$	29,945
Liability for Future Expenditures	119,604		119,492
Deferred Asset Retirement Obligation Costs	31,347		31,142
Deferred Pension and Other Postretirement Benefit Costs	59,284		59,284
Deferred Gas Costs - Net	34,008		—
Conservation Incentive Program Receivable	—		10,526
Societal Benefit Costs Receivable	5,528		10,408
Premium for Early Retirement of Debt	—		955
Deferred Interest Rate Contracts (Note 11)	4,735		3,735
Energy Efficiency Tracker	7,470		10,420
Pipeline Supplier Service Charges	6,690		7,106
Pipeline Integrity Cost	2,962		2,902
AFUDC - Equity Related Deferrals	8,631		7,810
Other Regulatory Assets	2,441		2,356
Total Regulatory Assets	$	309,290	$	296,081

Schedule of Regulatory Liabilities

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

	March 31, 2014		December 31, 2013
Excess Plant Removal Costs	$	39,647	$	40,029
Deferred Revenues-Net	—		19,067
Conservation Incentive Program Payable	6,193		—
Other Regulatory Liabilities	2,318		1,853
Total Regulatory Liabilities	$	48,158	$	60,949