Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Reclassification out of Accumulated Other Comprehensive Income

The components of the reclassification adjustments for the period, net of tax, included in Other Comprehensive Income were as follows (in thousands):

	Location on the Statements of Income (Loss)	Amounts Reclassified from AOCI
		2018			2017
Gains and (losses) on cash flow hedges:
Interest rate swaps	Interest expense	$	64		$	64
Income tax	Income tax benefit (expense)	(13		)	(22		)
Total reclassification adjustments related to cash flow hedges, net of tax		$	51		$	42
Amortization of defined benefit plans:
Actuarial gain (loss)	Operations and maintenance	$	103		$	86
Income tax	Income tax benefit (expense)	(22		)	(30		)
Total reclassification adjustments related to defined benefit plans, net of tax		$	81		$	56

Schedule of Accumulated Other Comprehensive Income (Loss)

Balances by classification included within Accumulated other comprehensive loss on the accompanying Balance Sheets were as follows (in thousands):

	Interest Rate Swaps			Employee Benefit Plans			Total
As of December 31, 2017	$	(551	)	$	(707	)	$	(1,258	)
Other comprehensive income (loss) before reclassifications	—			235			235
Amounts reclassified from AOCI	51			81			132
As of December 31, 2018	$	(500	)	$	(391	)	$	(891	)
	Interest Rate Swaps			Employee Benefit Plans			Total
As of December 31, 2016	$	(593	)	$	(669	)	$	(1,262	)
Other comprehensive income (loss) before reclassifications	—			(94		)	(94		)
Amounts reclassified from AOCI	42			56			98
As of December 31, 2017	$	(551	)	$	(707	)	$	(1,258	)