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Employee Retirement Plans (Details Textual) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Defined Benefit Plan, Expected Contributions in Current Fiscal Year, Total | $ 1.3

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- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2709-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration