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Retirement Plan (Details Textual) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Retirement Plan (Additional Textual) [Abstract] |  |
Equity and debt investment fluctuations by plus or minus | 20.00% |
Contribution to ERISA plan | $ 750,000 |
Weighted-average discount rate and rate of increase in periodic pension costs | 4.40% | 4.40%
Expected long-term rate of return on plan assets | 7.50% | 7.50%
Equities [Member] |  |
Retirement Plan (Textual) [Abstract] |  |
Current investment policy target | 65.00% |
Investment mix target allocation | 68.00% | 66.00%
Debt [Member] |  |
Retirement Plan (Textual) [Abstract] |  |
Current investment policy target | 25.00% |
Investment mix target allocation | 27.00% | 29.00%
Money market funds [Member] |  |
Retirement Plan (Textual) [Abstract] |  |
Current investment policy target | 10.00% |
Investment mix target allocation | 5.00% | 5.00%

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- Definition Defined benefit plan assets, target allocation period increase (decrease) percentage. + References No definition available. + Details
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- Definition Defined benefit plan expected long term rate of return on plan assets. + References No definition available. + Details
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- Definition Defined benefit plan investment mix. + References No definition available. + Details
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- Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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