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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance as of January 1	$ 3,452	$ 3,101	$ 2,838
Tax positions related to the current year:
Additions	93	381	387
Tax positions related to prior years:
Additions	0	28	0
Reductions	(58)	0	(11)
Expiration of statutes of limitation	(71)	(58)	(113)
Balance as of December 31	$ 3,416	$ 3,452	$ 3,101

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