|
Description of Business (Details)
|
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2011
Segments
|
Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Description of Business [Abstract] | ||||
| Number of reportable segments | 2 | 2 | ||
| Percentage of ownership in general partnership | 99.55% | 99.55% | ||
| Percentage of interest in preferred units | 100.00% | 100.00% | ||
| Percentage of common limited partnership interest | 0.45% | 0.45% | ||
| Conversion basis of common stock | 0.4464 | 0.4464 | 0.4464 | 0.4464 |