Consolidated Balance Sheets (Parentheticals)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity:
Limited partners: Depositary units issued	115,900,309	104,850,813
Limited partners: Depositary units outstanding	115,900,309	104,850,813
Treasury units at cost, units outstanding		0	1,137,200	1,137,200