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Stock-Based Compensation Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of stock options exercised $ 59 $ 111 $ 96 $ 1,166
Cash received from stock option exercises 443 329 608 2,828
Income tax benefit from the exercise of stock options $ 24 $ 44 $ 37 $ 455