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Income Taxes - Deferred income tax assets and liabilities (Details) (USD $)
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Dec. 31, 2012
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Dec. 31, 2011
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| Deferred Tax Assets, Net [Abstract] | ||
| Compensation accruals | $ 2,151,789 | $ 1,710,319 |
| Reserves | 2,603,512 | 2,296,691 |
| Other accruals | 1,302,684 | 541,408 |
| Net operating losses | 267,996 | 334,033 |
| Interest rate swaps | 3,125,847 | 2,601,154 |
| Credits | 1,225,197 | 3,434,973 |
| Deferred revenue | 1,336,827 | 0 |
| Gross deferred income tax assets | 12,013,852 | 10,918,578 |
| Valuation allowance | (2,827,444) | (2,869,637) |
| Total deferred income tax assets | 9,186,408 | 8,048,941 |
| Deferred income tax liabilities: | ||
| Depreciation | (26,839,863) | (27,787,503) |
| Contract refinancing | (725,328) | (1,029,451) |
| Canada | (949,850) | (2,248,078) |
| Acquisition accounting | (368,878) | (480,341) |
| Total deferred income tax liabilities | (28,883,919) | (31,545,373) |
| Deferred income tax assets and liabilities, net | $ (19,697,511) | $ (23,496,432) |
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- Definition
Deferred Tax Assets, Deferred Revenue No definition available.
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Deferred Tax Liabilities, Contract Refinancing No definition available.
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Deferred Tax Liabilities, Foreign Authority No definition available.
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- Definition
Deferred Tax Liabliities, Acquistion Accounting No definition available.
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- Definition
Amount before allocation of valuation allowances of deferred tax liability to taxable temporary differences. 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 temporary differences from derivative instruments. 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 temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. 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 temporary differences from compensation and benefits costs. 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 temporary differences from loss reserves other than estimated credit losses. 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 temporary differences from other reserves and accruals not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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