CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (USD $) In Thousands, except Share data	Total	General Partner [Member]	Common Stock [Member]	Non-Controlling Interest [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2012	$ 617,447	$ 10,026	$ 605,019	$ 2,845	$ (443)
Balance, units at Dec. 31, 2012			106,027,836
Issuance of common units	75,000		75,000
Issuance of common units, shares			3,784,572
Capital contribution	1,531	1,531
Cost associated with equity transactions	(60)		(60)
Distributions	(186,317)	(3,697)	(181,191)	(1,429)
Net income	125,097	2,502	122,595
Interest rate swap from unconsolidated investments	108				108
Loss on interest hedge	38				38
Comprehensive income	125,243				146
Balance at Sep. 30, 2013	$ 632,844	$ 10,362	$ 621,363	$ 1,416	$ (297)
Balance, units at Sep. 30, 2013			109,812,408