Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions |
1 Months Ended | |
|---|---|---|
Jul. 08, 2015 |
Jul. 20, 2015 |
|
| Subsequent Event [Line Items] | ||
| Common stock dividends declared and issued (in shares) | 3,082,713 | |
| Expected exploration and development costs | $ 3 |