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Fair Value Disclosures (Detail Textuals) (Revolving credit facility, USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Revolving credit facility |  |
Line of Credit Facility [Line Items] |  |
Outstanding borrowings under the facility | $ 53.3 | $ 107.0

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration