Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Changes in Accumulated Other Comprehensive Loss, Net of Tax

Changes in accumulated other comprehensive loss, net of tax, for the three and nine months ended Sept. 30, 2018 and 2017 were as follows:

	Three Months Ended Sept. 30, 2018
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit and Postretirement Items			Total
Accumulated other comprehensive loss at July 1	$	(752	)	$	(654	)	$	(1,406	)
Losses reclassified from net accumulated other comprehensive loss	13			18			31
Net current period other comprehensive income	13			18			31
Accumulated other comprehensive loss at Sept. 30	$	(739	)	$	(636	)	$	(1,375	)

	Three Months Ended Sept. 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit and Postretirement Items			Total
Accumulated other comprehensive loss at July 1	$	(659	)	$	(582	)	$	(1,241	)
Losses reclassified from net accumulated other comprehensive loss	10			16			26
Net current period other comprehensive income	10			16			26
Accumulated other comprehensive loss at Sept. 30	$	(649	)	$	(566	)	$	(1,215	)

	Nine Months Ended Sept. 30, 2018
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit and Postretirement Items			Total
Accumulated other comprehensive loss at Jan. 1	$	(776	)	$	(691	)	$	(1,467	)
Losses reclassified from net accumulated other comprehensive loss	37			55			92
Net current period other comprehensive income	37			55			92
Accumulated other comprehensive loss at Sept. 30	$	(739	)	$	(636	)	$	(1,375	)

	Nine Months Ended Sept. 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit and Postretirement Items			Total
Accumulated other comprehensive loss at Jan. 1	$	(678	)	$	(612	)	$	(1,290	)
Losses reclassified from net accumulated other comprehensive loss	29			46			75
Net current period other comprehensive income	29			46			75
Accumulated other comprehensive loss at Sept. 30	$	(649	)	$	(566	)	$	(1,215	)

Reclassifications out of Accumulated Other Comprehensive Loss

Reclassifications from accumulated other comprehensive loss for the three and nine months ended Sept. 30, 2018 and 2017 were as follows:

	Amounts Reclassified from Accumulated Other Comprehensive Loss
(Thousands of Dollars)	Three Months Ended Sept. 30, 2018				Three Months Ended Sept. 30, 2017
Losses on cash flow hedges:
Interest rate derivatives	$	16		(a)	$	16		(a)
Total, pre-tax	16				16
Tax benefit	(3		)		(6		)
Total, net of tax	13				10
Defined benefit pension and postretirement losses:
Amortization of net loss	23			(b)	24			(b)
Total, pre-tax	23				24
Tax benefit	(5		)		(8		)
Total, net of tax	18				16
Total amounts reclassified, net of tax	$	31			$	26

	Amounts Reclassified from Accumulated Other Comprehensive Loss
(Thousands of Dollars)	Nine Months Ended Sept. 30, 2018				Nine Months Ended Sept. 30, 2017
Losses on cash flow hedges:
Interest rate derivatives	$	47		(a)	$	47		(a)
Total, pre-tax	47				47
Tax benefit	(10		)		(18		)
Total, net of tax	37				29
Defined benefit pension and postretirement losses:
Amortization of net loss	70			(b)	72			(b)
Total, pre-tax	70				72
Tax benefit	(15		)		(26		)
Total, net of tax	55				46
Total amounts reclassified, net of tax	$	92			$	75

^(a) Included in interest charges.

^(b)  Included in the computation of net periodic pension and postretirement benefit costs. See Note 10 to the financial statements for details regarding these benefit plans.