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Acquisition (Pro Forma Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Acquisition [Abstract]    
Net operating revenue $ 59,397 $ 56,717
Net earnings $ 5,153 $ 2,143
Basic and diluted earnings per share $ 0.21 $ 0.09