Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax

Changes in accumulated other comprehensive loss, net of tax, for the years ended Dec. 31, 2015 and 2014 were as follows:

	Gains and Losses on Cash Flow Hedges
(Thousands of Dollars)	Year Ended Dec. 31, 2015			Year Ended Dec. 31, 2014
Accumulated other comprehensive loss at Jan. 1	$	(23,878	)	$	(23,338	)
Other comprehensive loss before reclassifications	(30		)	(72		)
Losses (gains) reclassified from net accumulated other comprehensive loss	72			(468		)
Net current period other comprehensive income (loss)	42			(540		)
Accumulated other comprehensive loss at Dec. 31	$	(23,836	)	$	(23,878	)

Reclassifications out of Accumulated Other Comprehensive Loss

Reclassifications from accumulated other comprehensive loss for the years ended Dec. 31, 2015 and 2014 were as follows:

	Amounts Reclassified from Accumulated Other Comprehensive Loss
(Thousands of Dollars)	Year Ended Dec. 31, 2015				Year Ended Dec. 31, 2014
Losses (gains) on cash flow hedges:
Interest rate derivatives	$	54		(a)	$	(730	)	(a)
Vehicle fuel derivatives	57			(b)	(25		)	(b)
Total, pre-tax	111				(755		)
Tax expense	(39		)		287
Total amounts reclassified, net of tax	$	72			$	(468	)

^(a)  Included in interest charges.

^(b)  Included in O&M expenses.