Comprehensive income (loss) (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Accumulated comprehensive income (loss)

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

Three Months Ended June 30, 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	$	(2,231	)	$	(42,265	)	$	(190	)	$	(174	)	$	(44,860	)
Other comprehensive loss before reclassifications	—			—			(59		)	(43		)	(102		)
Amounts reclassified from accumulated other comprehensive loss	95			449			249			34			827
Net current-period other comprehensive income (loss)	95			449			190			(9		)	725
Balance at end of period	$	(2,136	)	$	(41,816	)	$	—		$	(183	)	$	(44,135	)

Three Months Ended June 30, 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	$	(2,209	)	$	(33,781	)	$	(140	)	$	(55	)	$	(36,185	)
Other comprehensive loss before reclassifications	—			—			(15		)	(24		)	(39		)
Amounts reclassified from accumulated other comprehensive loss	92			312			—			31			435
Net current-period other comprehensive income (loss)	92			312			(15		)	7			396
Balance at end of period	$	(2,117	)	$	(33,469	)	$	(155	)	$	(48	)	$	(35,789	)

Six Months Ended June 30, 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	—			—			(61		)	(148		)	(209		)
Amounts reclassified from accumulated other comprehensive loss	187			867			249			64			1,367
Net current-period other comprehensive income (loss)	187			867			188			(84		)	1,158
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	$	(2,136	)	$	(41,816	)	$	—		$	(183	)	$	(44,135	)

Six Months Ended June 30, 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 loss before reclassifications	—			—			(6		)	(51		)	(57		)
Amounts reclassified from accumulated other comprehensive loss	183			669			—			66			918
Amounts reclassified to accumulated other comprehensive loss from regulatory asset	—			(917		)	—			—			(917		)
Net current-period other comprehensive income (loss)	183			(248		)	(6		)	15			(56		)
Balance at end of period	$	(2,117	)	$	(33,469	)	$	(155	)	$	(48	)	$	(35,789	)

Reclassification out of accumulated other comprehensive income

The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parenthesis indicate a decrease to net income in the Consolidated Statements of Income. The reclassifications were as follows:

	Three Months Ended						Six Months Ended						Location on Consolidated Statements of Income
	June 30,						June 30,
	2018			2017			2018			2017
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income	$	(148	)	$	(148	)	$	(296	)	$	(295	)	Interest expense
	53			56			109			112			Income taxes
	(95		)	(92		)	(187		)	(183		)
Amortization of postretirement liability losses included in net periodic benefit cost (credit)	(594		)	(502		)	(1,167		)	(1,075		)	Other income
	145			190			300			406			Income taxes
	(449		)	(312		)	(867		)	(669		)
Reclassification adjustment for loss on foreign currency translation adjustment included in net income	(324		)	—			(324		)	—			Other income
	75			—			75			—			Income taxes
	(249		)	—			(249		)	—
Reclassification adjustment for loss on available-for-sale investments included in net income	(44		)	(48		)	(81		)	(102		)	Other income
	10			17			17			36			Income taxes
	(34		)	(31		)	(64		)	(66		)
Total reclassifications	$	(827	)	$	(435	)	$	(1,367	)	$	(918	)