CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts receivable, allowance for doubtful accounts	$ 801	$ 622
Common stock, par value
Common Stock, shares authorized	200,000,000	200,000,000
Common stock, issued	83,634,955	83,947,151
Common stock, outstanding	83,634,955	83,947,151
Treasury stock, common shares	510,923
Restricted Stock
Common stock, issued	669,554	465,290
Common stock, outstanding	669,554	465,290