CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable allowance for doubtful accounts	$ 1,634	$ 1,971
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	170,000,000	170,000,000
Common stock, shares issued	18,855,409	18,571,411
Common stock, shares outstanding	17,485,941	17,261,276
Treasury stock at par	1,369,468	1,310,135