|
Income Taxes (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
| Income Tax Disclosure [Abstract] | |||
| Ordinary dividends | 38.00% | 36.00% | 35.00% |
| Nontaxable distributions | 62.00% | 47.00% | 65.00% |
| Capital gain distributions | 0.00% | 17.00% | 0.00% |
| Total | 100.00% | 100.00% | 100.00% |
| Property, plant and equipment, land and real estate assets, net tax basis | $ 3,100,000,000 | ||
| State and local income tax and franchise tax expense (benefit), continuing operations | $ 1,400,000 | $ 1,300,000 | $ 1,200,000 |