Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Consolidated Balance Sheets:
Preferred units, units outstanding	796,948	796,948
Preferred units, Liquidation value (in dollars)	$ 39,847	$ 39,847
General Partner, units outstanding	311,268,775	310,787,910
Limited Partners, units outstanding	52,764,731	52,846,682