CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Valuation allowance	$ 44,816	$ 46,262
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	16,618,188	16,550,324
Common stock, shares outstanding (in shares)	16,528,197	16,465,621
Treasury stock, at cost	89,991	84,703