Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3,908	$ 3,534
Property and equipment, accumulated depreciation	46,924	43,202
Intangible assets, accumulated amortization	$ 13,923	$ 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		17,336,314
Common stock, shares outstanding		15,677,323
Treasury stock, shares outstanding	1,658,990	1,658,990