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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ (2,710) $ (3,477)
Property and equipment, accumulated depreciation (49,907) (45,766)
Intangible assets, accumulated amortization $ (19,610) $ (16,344)
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 18,754,697 18,420,914
Common stock, shares outstanding 17,095,706 16,761,923
Treasury stock, shares outstanding 1,658,991 1,658,991