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Commitments (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Commitments (Textual) [Abstract] |  |  |  |
Rent expense | $ 488,000 | $ 547,000 | $ 1,500,000 | $ 1,600,000
Expiration of operating lease agreements |  |  | Through 2018 |
Expiration of other contractual obligations |  |  | Through 2016 |

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- Definition Expiration of operating lease agreements. + References No definition available. + Details
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- Definition Expiration of other contractual obligations. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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