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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of the beginning and ending amount of uncertain tax positions      
Additions based on tax positions related to the current year $ 217 $ 131 $ 48
Additions based on tax positions of prior years 0 0 82
Reductions for tax positions of prior years (51) (35) (355)
Settlements (157) (4) (65)
Balance at beginning of year 700 608 898
Balance at end of year $ 709 $ 700 $ 608