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Regulatory Assets and Liabilities
9 Months Ended
Sep. 30, 2012
Regulatory Assets and Liabilities Disclosure [Abstract]  
Regulatory Assets and Liabilities
REGULATORY ASSETS AND LIABILITIES    

The following table details regulatory assets and liabilities on the balance sheets:
(in thousands)
September 30, 2012
December 31, 2011
 
Current
Noncurrent
Current
Noncurrent
Regulatory assets:
 
 
 
 
Pension and postretirement assets
$
170

$
79,984

$
170

$
77,587

Accretion and depreciation for asset retirement obligation

14,885


13,981

Risk management activities
14,990


56,804

3,070

Asset removal costs, net



994

Gas supply adjustment
40,998




Other
30


169

1

Total regulatory assets
$
56,188

$
94,869

$
57,143

$
95,633

Regulatory liabilities:
 
 
 
 
RSE adjustment
$
3,187

$

$
2,931

$

Unbilled service margin
5,799


22,419


Gas supply adjustment


12,626


Refundable negative salvage
18,353

55,389

20,269

65,646

Asset retirement obligation

21,525


20,785

Other
33

778

34

803

Total regulatory liabilities
$
27,372

$
77,692

$
58,279

$
87,234