CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Trade accounts receivables, allowance for doubtful accounts	$ 4,148	$ 1,563
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	112,219,000	78,031,000
Common stock, shares outstanding	112,219,000	78,031,000