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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 Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 635 $ 614 $ 318
Additions based on tax positions related to the current year 97 0 20
Additions based on tax positions related to prior years 415 43 474
Reductions as a result of a lapse in statute of limitations (101) (22) (198)
Balance at ending of year $ 0 $ 635 $ 614