|
Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Common stock, par value per share (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, shares issued (in shares) | 411,824,039 | 370,570,565 |
| Common stock, shares outstanding (in shares) | 411,350,440 | 370,363,803 |