Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 3,957	$ 4,246
Preferred stock, shares authorized	250	250
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	17,569	17,472