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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits
Unrecognized Tax Benefits, Beginning Balance	$ 12,900	$ 6,342	$ 2,672
Increases to tax positions related to the current year	11,854	5,631	3,913
Increases to tax positions related to the prior year	540	927	2,123
Reductions due to lapsed statute of limitations			(2,366)
Decreases to tax positions related to the prior year
Settlements during current year	(1,245)
Unrecognized Tax Benefits, Ending Balance	$ 24,049	$ 12,900	$ 6,342

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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