|
Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
|---|---|
|
Dec. 31, 2013
|
|
| Commitments and Contingencies [Abstract] | |
| Commitments for the drilling and development of investment properties | $ 5.2 |
| Commitments for the drilling and development of investment properties expected to be incurred in the next 12 months | $ 1.5 |