Subsequent Events (Tables)

12 Months Ended

Dec. 31, 2013

Subsequent Events [Abstract]

Schedule of Dividends Declared

The General Partner's board of directors declared the following dividends/distributions at its regularly scheduled board meeting held on January 29, 2014:

Class of stock/units	Quarterly Amount per Share or Unit		Record Date	Payment Date
Common	$	0.170000	February 14, 2014	February 28, 2014
Preferred (per depositary share):
Series J	$	0.414063	February 14, 2014	February 28, 2014
Series K	$	0.406250	February 14, 2014	February 28, 2014
Series L	$	0.412500	February 14, 2014	February 28, 2014