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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
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of the year $ 1,829 $ 629 $ 629
Increases related to current year tax positions 72 158 0
Increases related to prior year tax positions (5) 1,042 0
Balance at end of the year $ 1,896 $ 1,829 $ 629