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Employee Benefit Plans (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of weighted-average fair value of stock options granted        
Stock options granted (in thousands) 79 32 871 138
Weighted average fair value at date of grant $ 5.46 $ 6.42 $ 5.35 $ 6.09