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Employee benefit plans (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of net benefit costs

Components of net periodic benefit cost for the Company's pension and other postretirement benefit plans were as follows:

	Pension Benefits						Other Postretirement Benefits
Three Months Ended September 30,	2016			2015			2016			2015
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	—		$	—		$	412		$	454
Interest cost	4,305			4,285			922			902
Expected return on assets	(5,231		)	(5,563		)	(1,133		)	(1,199		)
Amortization of prior service credit	—			—			(343		)	(343		)
Amortization of net actuarial loss	1,553			1,734			371			511
Net periodic benefit cost, including amount capitalized	627			456			229			325
Less amount capitalized	82			90			(34		)	36
Net periodic benefit cost	$	545		$	366		$	263		$	289

	Pension Benefits						Other Postretirement Benefits
Nine Months Ended September 30,	2016			2015			2016			2015
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	—		$	86		$	1,236		$	1,362
Interest cost	12,915			12,855			2,766			2,705
Expected return on assets	(15,693		)	(16,689		)	(3,400		)	(3,597		)
Amortization of prior service cost (credit)	—			36			(1,029		)	(1,028		)
Amortization of net actuarial loss	4,660			5,282			1,118			1,525
Curtailment loss	—			258			—			—
Net periodic benefit cost, including amount capitalized	1,882			1,828			691			967
Less amount capitalized	284			219			4			98
Net periodic benefit cost	$	1,598		$	1,609		$	687		$	869

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- References

No definition available.

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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