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Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Taxes
Income tax expense	$ (3,486,000)	$ 3,846,000	$ 405,000	$ 9,334,000
Effective tax rate (as a percent)			149.40%	46.20%
Tax benefit on debt extinguishment costs	5,300,000
Tax expense on gain on sale of engines to WMES					$ 1,300,000
Gain on sale of engines to WMES recorded for book purposes (as a percent)					50.00%

- 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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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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