Stockholders' Equity - Authorized, Issued, and Outstanding Shares (Details) - $ / shares	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Stockholders' Equity Note [Abstract]
Preferred stock, Par Value per share	$ 0.01	$ 0.01	$ 0.01
Preferred stock, Shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, Shares issued	0	0	0
Preferred stock, Shares outstanding	0	0	0
Common stock, Par Value per share	$ 0.01	$ 0.01	$ 0.01
Common stock, Shares authorized	400,000,000	400,000,000	400,000,000
Common stock, Shares issued	290,149,384	295,867,844	296,764,444
Common stock, Shares outstanding	290,149,384	295,867,844	296,764,444