CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Property, building and equipment, accumulated depreciation	$ 52,804	$ 43,565
Intangible assets, accumulated amortization	$ 14,789	$ 13,041
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized	5,000,000	5,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	40,000,000
Common stock, shares issued	35,632,076	22,640,046
Treasury stock at cost, shares	4,958,423	4,890,504