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Income Taxes (Details) (USD $)	3 Months Ended			6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes
Effective income tax rate (as a percent)	0.00%	(1.20%)		0.00%	0.00%
Income tax expense realized due to discrete item			$ 15,000

- 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.

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