Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Receivable, allowance for doubtful accounts	$ 36,246	$ 29,332
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	180,000,000	90,000,000
Common stock, shares issued	86,571,040	70,745,746
Common stock, shares outstanding	86,571,040	70,745,746