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Income Taxes - Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1, 2012	$ 3,180
Additions for tax positions related to current year	1,118
Additions for tax positions of prior years	93
Reductions for tax position of prior years	0
Balance at September 30, 2012	4,391
Unrecognized tax benefits, income tax penalties and interest expense	$ 847

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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