CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Property, building and equipment, accumulated depreciation	$ 74,486	$ 69,441
Intangible assets, accumulated amortization	$ 17,070	$ 16,431
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	36,327,819	36,129,280
Common stock, shares outstanding (in shares)	31,121,968	30,992,390
Treasury stock at cost, shares (in shares)	5,205,851	5,136,890