Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares |
Mar. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|---|
| Preferred stock, par value per share | $ 0.01 | $ 0.01 | |
| Preferred stock, shares authorized | 150,000,000 | 150,000,000 | |
| Preferred stock, shares issued | 0 | 0 | |
| Preferred stock, shares outstanding | 0 | 0 | |
| Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 1,500,000,000 | 1,500,000,000 | 1,500,000,000 |
| Common stock, shares, issued | 196,221,296 | 196,216,596 | 195,743,154 |
| Common stock, shares, outstanding | 196,221,296 | 196,216,596 | 195,743,154 |