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Financial Instruments (Details Textual) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Financial Instruments (Additional Textual) [Abstract] |  |
Corporate and municipal bonds | $ 25,800,000 | $ 28,200,000
Maturity dates of bonds, start date | 2013-07 |
Maturity dates of bonds, end date | 2018-01 |
Interest at a fixed rate | 1.41% |
Interest rate swap [Member] |  |
Financial Instruments (Textual) [Abstract] |  |
Notional value | 40,000,000 |
Interest rate swap description | Interest that varies with the three-month LIBOR |
June 2014 [Member] | Interest rate swap [Member] |  |
Financial Instruments (Textual) [Abstract] |  |
Notional value | 25,000,000 |
Interest rate swap expiration date | 2014-06 |
June 2015 [Member] | Interest rate swap [Member] |  |
Financial Instruments (Textual) [Abstract] |  |
Notional value | $ 15,000,000 |
Interest rate swap expiration date | 2015-06 |

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- Definition Corporate and municipal bonds. + References No definition available. + Details
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- Details
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- Definition Maturity date of bond end date. + References No definition available. + Details
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- Definition Maturity date of bond start date. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Total monetary amount specified by the derivative liability (or liabilities). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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