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Income Taxes (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of unrecognized tax benefits
Beginning balance	$ 14,745	$ 15,614	$ 19,756
Additions based on tax positions related to current year	289
Additions based on tax positions related to prior years	1,579
Reductions based on settlement with government authority	(5,753)
Reductions based on lapse of statute of limitations	1,263	(167)
Reductions based on tax positions related to prior years		(702)	(4,142)
Ending balance	$ 9,597	$ 14,745	$ 15,614

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