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Stock-Based Compensation (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Stock-based employee compensation expense |  |
Stock-based compensation expense | $ 374 | $ 441
Tax | 145 | 171
Stock-based compensation expense, net of tax | $ 229 | $ 270

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