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Net Earnings Per Share Net Earnings Per Share (Details textual)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Effect of stock-based compensation awards, shares excluded for purposes of diluted earnings per share 48,000 152,000 1,102,000 1,142,000