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Accounting for Income Taxes - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Line Items]
Provision for income taxes	$ 2,920,000	$ 6,210,000
Effective Income Tax Rate, Continuing Operations	(7.50%)	22.80%
Increase in gross unrecognized tax benefits	1,400,000
Unrecognized tax benefits	$ 22,100,000

- 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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- 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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