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:

	Gains and Losses on Cash Flow Hedges
(Thousands of Dollars)	Three Months Ended Sept. 30, 2018			Three Months Ended Sept. 30, 2017
Accumulated other comprehensive loss at July 1	$	(23	)	$	(95	)
Losses reclassified from net accumulated other comprehensive loss	23			19
Net current period other comprehensive income	23			19
Accumulated other comprehensive loss at Sept. 30	$	—		$	(76	)

	Gains and Losses on Cash Flow Hedges
(Thousands of Dollars)	Nine Months Ended Sept. 30, 2018			Nine Months Ended Sept. 30, 2017
Accumulated other comprehensive loss at Jan. 1	$	(69	)	$	(133	)
Losses reclassified from net accumulated other comprehensive loss	69			57
Net current period other comprehensive income	69			57
Accumulated other comprehensive loss at Sept. 30	$	—		$	(76	)

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	$	32		(a)	$	32		(a)
Total, pre-tax	32				32
Tax benefit	(9		)		(13		)
Total amounts reclassified, net of tax	$	23			$	19

	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	$	95		(a)	$	94		(a)
Total, pre-tax	95				94
Tax benefit	(26		)		(37		)
Total amounts reclassified, net of tax	$	69			$	57

^(a)  Included in interest charges.