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Income Taxes (Details Textual) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Income Taxes (Textual) [Abstract] | |||
| Qualified domestic production activity deduction | $ 1,522,000 | $ 1,511,000 | $ 1,198,000 |
| Effective tax rate | 5.10% | 2.00% | 5.30% |
| Income tax payments | 15,000,000 | 16,900,000 | 7,800,000 |
| Reserve for uncertain tax positions | 0 | ||
| Date of enactment of American Taxpayer Relief Act | Jan. 02, 2013 | ||
| Extended expiry date | Dec. 31, 2013 | ||
| Research and development tax credit | 77,000 | ||
| Alternative fuel tax credit | $ 127,000 | ||
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Research and Development Expense [Member]
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| Tax Credit Carryforward [Line Items] | |||
| Expiry date | Dec. 31, 2011 | ||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible tax credit carryforwards not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the deduction for qualified production activities received under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the deduction for qualified production activities received under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Expiration date of the tax credit carryforward, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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- Definition
Tax credit carryforward extended expiration date. No definition available.
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| X | ||||||||||
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- Definition
Tax payer relief act enactment date. No definition available.
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