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Net Earnings Per Share Net Earnings Per Share (Details textual)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Effect of stock-based compensation awards, shares excluded for purposes of diluted earnings per share 142,000 85,000 136,000 478,000