Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,967	$ 3,477
Property and equipment, accumulated depreciation	(47,117)	(45,766)
Intangible assets, accumulated amortization	$ 17,412	$ 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	18,700,561	18,420,914
Common stock, shares outstanding	16,260,583	16,761,923
Treasury stock, shares outstanding	1,658,991	1,658,991