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Shareholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at the beginning of the period $ 70,335 $ 66,668
Net income 490 731
Treasury stock purchased 0 (574)
Share-based compensation 84 59
Excess Tax Benefit from Share-based Compensation, Financing Activities 87 0
Exercise of stock options 1,021 76
Stock issued for acquisitions 1,679 0
Unrealized gain or loss on investments, net of tax 73 0
Balance at end of the period $ 73,769 $ 66,960