Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,987	$ 2,087
Common stock, par value
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	23,992,000	23,948,000
Common Stock, shares outstanding	23,992,000	23,948,000