|
Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
| Subsequent Event, Revolving Credit Facility (Textual) [Abstract] | |
| Increase in revolving credit facility, post amendment | $ 325 |
| Original revolving credit facility, pre amendment | 255 |
| Extended maturity date | Jul. 31, 2015 |
| Decreased credit facility unused capacity fee percentage | 0.50% |
| Original credit facility unused capacity fee percentage | 0.375% |
| Decreased credit facility commitment fee percentage, applicable minimum outstanding amount | $ 275 |