Income Taxes (Details 1)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Effective tax rate as applied to pre-tax income or loss from continuing operations
U.S. federal statutory rate	35.00%	35.00%	35.00%
State taxes (net of federal tax benefit and change in valuation allowance)	15.00%	1.00%	22.00%
Permanent items	0.00%	(1.00%)	0.00%
Federal tax credits	(8.00%)	1.00%	(7.00%)
Federal valuation allowance	(2.00%)	(4.00%)	0.00%
Effect of tax law change	0.00%	(1.00%)	0.00%
Unrecognized Tax Benefits	2.00%	0.00%	8.00%
Total	42.00%	31.00%	58.00%

Effective income tax rate reconciliation unrecognized tax benefit.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 2

-Article 4

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

+ Details

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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 changes in the valuation allowance for deferred tax assets.

+ References

No definition available.

+ Details

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- Definition

The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) that is attributable to changes in the income tax laws or rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 45

-Subparagraph g

+ Details

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- Definition

The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to all nondeductible expenses under enacted tax laws.

+ References

No definition available.

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- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense (benefit), net of the federal tax benefit (expense) thereon, recorded during the period.

+ References

No definition available.

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- Definition

The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

+ References

No definition available.

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