REGULATORY ASSETS AND LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2020

SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]

SCHEDULE OF REGULATED ASSETS AND LIABILITIES

The tables below present a summary of regulatory assets and liabilities, net of amortization, for the periods indicated:

	March 31, 2020
	Current			Noncurrent			Total
	(Thousands of dollars)
Pension and postemployment benefit costs	$	21,199		$	363,467		$	384,666
Reacquired debt costs	812			5,474			6,286
MGP remediation costs	98			9,685			9,783
Ad-valorem tax	3,593			—			3,593
Weather normalization	3,713			—			3,713
Other	10,393			2,060			12,453
Total regulatory assets, net of amortization	39,808			380,686			420,494
Federal income tax rate changes	(6,282		)	(494,210		)	(500,492		)
Over-recovered purchased-gas costs	(27,367		)	—			(27,367		)
Total regulatory liabilities, net of amortization	(33,649		)	(494,210		)	(527,859		)
Net regulatory assets and liabilities	$	6,159		$	(113,524	)	$	(107,365	)

	December 31, 2019
	Current			Noncurrent			Total
	(Thousands of dollars)
Under-recovered purchased-gas costs	$	17,172		$	—		$	17,172
Pension and postemployment benefit costs	21,213			373,266			394,479
Reacquired debt costs	812			5,677			6,489
MGP remediation costs	98			9,709			9,807
Ad-valorem tax	2,921			—			2,921
Other	5,224			2,384			7,608
Total regulatory assets, net of amortization	47,440			391,036			438,476
Federal income tax rate changes	(10,297		)	(503,518		)	(513,815		)
Over-recovered purchased-gas costs	(27,623		)	—			(27,623		)
Weather normalization	(7,281		)	—			(7,281		)
Total regulatory liabilities	(45,201		)	(503,518		)	(548,719		)
Net regulatory assets and liabilities	$	2,239		$	(112,482	)	$	(110,243	)