Pensions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Expected contribution to defined benefit pension plan in next fiscal year	$ 2,327
Estimated net loss amortized from accumulated other comprehensive income (loss) into net periodic pension cost in the next fiscal year	$ 554

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration