Comprehensive income (loss)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Comprehensive income (loss)

Comprehensive income (loss)

The after-tax changes in the components of accumulated other comprehensive loss were as follows:

Three Months Ended March 31, 2018	Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges			Postretirement Liability Adjustment			Foreign Currency Translation Adjustment			Net Unrealized Gain (Loss) on Available-for-sale Investments			Total Accumulated Other Comprehensive Loss
	(In thousands)
Balance at beginning of period	$	(1,934	)	$	(35,163	)	$	(155	)	$	(82	)	$	(37,334	)
Other comprehensive loss before reclassifications	—			—			(2		)	(105		)	(107		)
Amounts reclassified from accumulated other comprehensive loss	92			418			—			30			540
Net current-period other comprehensive income (loss)	92			418			(2		)	(75		)	433
Reclassification adjustment of prior period tax effects related to TCJA included in accumulated other comprehensive loss	(389		)	(7,520		)	(33		)	(17		)	(7,959		)
Balance at end of period	$	(2,231	)	$	(42,265	)	$	(190	)	$	(174	)	$	(44,860	)

Three Months Ended March 31, 2017	Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges			Postretirement Liability Adjustment			Foreign Currency Translation Adjustment			Net Unrealized Gain (Loss) on Available-for-sale Investments			Total Accumulated Other Comprehensive Loss
	(In thousands)
Balance at beginning of period	$	(2,300	)	$	(33,221	)	$	(149	)	$	(63	)	$	(35,733	)
Other comprehensive income (loss) before reclassifications	—			—			9			(27		)	(18		)
Amounts reclassified from accumulated other comprehensive loss	91			357			—			35			483
Amounts reclassified to accumulated other comprehensive loss from regulatory asset	—			(917		)	—			—			(917		)
Net current-period other comprehensive income (loss)	91			(560		)	9			8			(452		)
Balance at end of period	$	(2,209	)	$	(33,781	)	$	(140	)	$	(55	)	$	(36,185	)

Reclassifications out of accumulated other comprehensive loss were as follows:

	Three Months Ended						Location on Consolidated Statements of Income
	March 31,
	2018			2017
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income	$	(148	)	$	(147	)	Interest expense
	56			56			Income taxes
	(92		)	(91		)
Amortization of postretirement liability losses included in net periodic benefit cost (credit)	(573		)	(574		)	Other income
	155			217			Income taxes
	(418		)	(357		)
Reclassification adjustment for loss on available-for-sale investments included in net income	(37		)	(54		)	Other income
	7			19			Income taxes
	(30		)	(35		)
Total reclassifications	$	(540	)	$	(483	)