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Defined Benefit Plans Additional Information (Details) | 3 Months Ended
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Mar. 31, 2017 USD ($)
Compensation and Retirement Disclosure [Abstract] |
Defined Benefit Plan, Expected Contributions in Current Fiscal Year | $ 0

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=65897934&loc=d3e2709-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration