Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock par value (in usd per share)	$ 0.001	$ 0.001
Common stock shares authorized	300,000,000	300,000,000
Common stock shares issued	98,450,128	95,877,947
Common stock shares outstanding	94,029,796	95,832,238
Preferred stock par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares held	3,885,695	0