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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Activity related to the Company's valuation allowance
Balance at beginning of period	$ 26,557	$ 18,025	$ 1,904
Additions	1,797	8,532	16,121
Deductions
Balance at end of period	$ 28,354	$ 26,557	$ 18,025

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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