Comprehensive income (loss) (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Comprehensive income (loss)

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

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	)

Three Months Ended June 30, 2016	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	$	(2,575	)	$	(35,852	)	$	(175	)	$	20		$	(38,582	)
Other comprehensive income (loss) before reclassifications	—			—			31			(30		)	1
Amounts reclassified from accumulated other comprehensive loss	91			248			—			36			375
Net current-period other comprehensive income	91			248			31			6			376
Balance at end of period	$	(2,484	)	$	(35,604	)	$	(144	)	$	26		$	(38,206	)

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 a 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	)

Six Months Ended June 30, 2016	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	$	(2,667	)	$	(34,257	)	$	(200	)	$	(24	)	$	(37,148	)
Other comprehensive income (loss) before reclassifications	—			—			56			(19		)	37
Amounts reclassified from accumulated other comprehensive loss	183			(1,347		)	—			69			(1,095		)
Net current-period other comprehensive income (loss)	183			(1,347		)	56			50			(1,058		)
Balance at end of period	$	(2,484	)	$	(35,604	)	$	(144	)	$	26		$	(38,206	)

Reclassification out of accumulated other comprehensive income

Reclassifications out of accumulated other comprehensive loss were as follows:

	Three Months Ended						Six Months Ended						Location on Consolidated Statements of Income
	June 30,						June 30,
	2017			2016			2017			2016
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income (loss)	$	(148	)	$	(147	)	$	(295	)	$	(297	)	Interest expense
	56			56			112			114			Income taxes
	(92		)	(91		)	(183		)	(183		)
Amortization of postretirement liability gains (losses) included in net periodic benefit cost (credit)	(502		)	(398		)	(1,075		)	2,166			(a)
	190			150			406			(819		)	Income taxes
	(312		)	(248		)	(669		)	1,347
Reclassification adjustment for loss on available-for-sale investments included in net income (loss)	(48		)	(55		)	(102		)	(106		)	Other income
	17			19			36			37			Income taxes
	(31		)	(36		)	(66		)	(69		)
Total reclassifications	$	(435	)	$	(375	)	$	(918	)	$	1,095

(a) Included in net periodic benefit cost (credit). For more information, see Note 14.