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Components of net periodic benefit cost (Tables)

3 Months Ended

Mar. 31, 2014

Components of net periodic benefit cost [Abstract]

Schedule of net periodic benefit cost

	Pension Benefits
	Three months ended March 31,
	2014			2013
Service cost	$	1,587		$	680
Interest cost	2,640			1,635
Expected return on plan assets	(3,397		)	(1,720		)
Amortization of prior service costs	9			32
Amortization of net loss	787			849
Net periodic benefit cost	$	1,626		$	1,476

	Other Postretirement Benefits ("OPEB")
	Three months ended March 31,
	2014			2013
Service cost	$	677		$	493
Interest cost	1,511			1,323
Amortization of prior service cost	(961		)	(1,060		)
Amortization of net loss	1,024			1,503
Net periodic benefit cost	$	2,251		$	2,259

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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=28361610&loc=d3e1928-114920

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