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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ (2,489) $ (2,852)
Property and equipment, accumulated depreciation (54,096) (51,099)
Intangible assets, accumulated amortization $ (22,799) $ (20,656)
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 18,936,639 18,787,816
Common stock, shares outstanding 17,654,217 17,128,825
Treasury stock, shares outstanding 1,282,422 1,658,991