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Earnings Per Share (Details 1)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Securities not included in the computation of diluted earnings per share        
Options to purchase shares of common stock 43 1,049 465 1,034