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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 4,044 $ 3,534
Property and equipment, accumulated depreciation 47,514 43,202
Intangible assets, accumulated amortization $ 12,673 $ 11,390
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 17,477,727 17,336,314
Common stock, shares outstanding 15,818,736 15,677,323
Treasury stock, shares outstanding 1,658,990 1,658,990