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Long Term Debt (Details Textual) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Long term debt (Textual) [Abstract] |  |
Agreement on Senior secured revolving credit facility | 5 years |
Letter of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Limitation for the issuance of standby letters of credit | $ 7.5 |
Long term debt (Textual) [Abstract] |  |
Limitation for the issuance of standby letters of credit | 7.5 |
Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Borrowing capacity | 75.0 |
Provision conditioned by credit facility | 50.0 |
Credit Facility amount outstanding | $ 15.0 | $ 15.0
Credit Facility Interest Periods | 1, 2, 3 or 6 months |
Credit Facility Interest rate | 2.00% |
Acquisitions | less than 100% owned subsidiaries |
Minimum percentage of owned subsidiaries | 100.00% |
Minimum interest coverage ratio | at least 4.00:1 |
Minimum percentage of interest adjustment | 4.00% |
Leverage ratio | no greater than 2.75:1 |
Maximum percentage of indebtedness | 2.75% |
Maximum [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Percentage of margin on principal amount | 2.50% |
Commitment fee | 0.50% |
Minimum [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Percentage of margin on principal amount | 0.75% |
Commitment fee | 0.35% |

X
- 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
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Balance Type: | credit
Period Type: | instant

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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Definition Leverage ratio. + References No definition available. + Details
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- Definition Line of credit facility amended term period. + References No definition available. + Details
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- Definition Line of credit facility basis spread on alternate base rate. + References No definition available. + Details
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- Definition Line of credit facility conditional provision for increase decrease. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility description of London Inter Bank offered rate. + References No definition available. + Details
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- Details
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- Definition Maximum leverage ratio. + References No definition available. + Details
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- Definition Minimum interest coverage ratio. + References No definition available. + Details
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- Definition Minimum interest coverage ratio. + References No definition available. + Details
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- Definition Minority interest ownership percentage by parent description. + References No definition available. + Details
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