CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Property, building and equipment, accumulated depreciation	$ 55,253	$ 43,565
Intangible assets, accumulated amortization	$ 15,176	$ 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	35,636,414	22,640,046
Treasury stock at cost, shares	(4,958,721)	(4,890,504)