CONDENSED CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Units	General Partner Interest	Accumulated Other Comprehensive Income/(Loss)
Balance at Dec. 31, 2012	$ 446,193	$ 448,943	$ 1	$ (2,751)
Balance (in units) at Dec. 31, 2012		73,065,143
Increase (Decrease) in Partners' Capital
Cash distributions to common unitholders-Affiliates	(9,776)	(9,776)
Cash distributions to common unitholders-Non-affiliates	(4,252)	(4,252)
Share-based compensation-Affiliates	1,186	1,186
Net income	35,553	35,553
Net gains (losses) on interest rate swaps	212			212
Balance at Mar. 31, 2013	$ 469,116	$ 471,654	$ 1	$ (2,539)
Balance (in units) at Mar. 31, 2013		73,065,143