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:

	Year Ended Dec. 31, 2015
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive loss at Jan. 1	$	(989	)	$	—		$	(989	)
Other comprehensive loss before reclassifications	—			(464		)	(464		)
Losses reclassified from net accumulated other comprehensive loss	172			—			172
Net current period other comprehensive income (loss)	172			(464		)	(292		)
Accumulated other comprehensive loss at Dec. 31	$	(817	)	$	(464	)	$	(1,281	)

	Year Ended Dec. 31, 2014
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges
Accumulated other comprehensive loss at Jan. 1	$	(1,161	)
Losses reclassified from net accumulated other comprehensive loss	172
Net current period other comprehensive income	172
Accumulated other comprehensive loss at Dec. 31	$	(989	)

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 on cash flow hedges:
Interest rate derivatives	$	269		(a)	$	268		(a)
Total, pre-tax	269				268
Tax benefit	(97		)		(96		)
Total amounts reclassified, net of tax	$	172			$	172

^(a)  Included in interest charges.