CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $)	Total USD ($)	Subtotal	Class A USD ($)	Class B USD ($)	General Partnership USD ($)	Treasury Units
Balance at Aug. 20, 2007
Increase (Decrease) in Partners' Capital
Stock Buyback	$ (32,408,000)				$ (655.55)
Stock Buyback (in units)					110
Balance at Sep. 30, 2013	(21,121,940)				(210,908)
Balance (in units) at Sep. 30, 2013	129,539	180,225			1,802
Balance at Dec. 31, 2011	(21,310,852)		(17,052,134)	(4,045,783)	(212,935)
Balance (in units) at Dec. 31, 2011	131,484	180,225	144,180	34,243	1,802	48,741
Increase (Decrease) in Partners' Capital
Distribution to Partners	(2,952,515)		(2,362,012)	(560,978)	(29,525)
Stock Buyback	(610,294)		(488,627)	(115,584)	(6,083)
Stock Buyback (in units)	(708)					708
Net Income	2,448,668		1,958,935	465,247	24,487
Balance at Sep. 30, 2012	(22,424,992)		(17,943,838)	(4,257,098)	(224,056)
Balance (in units) at Sep. 30, 2012	130,776	180,225	144,180	34,243	1,802	49,449
Balance at Dec. 31, 2012	(22,515,678)		(18,017,082)	(4,273,666)	(224,929)
Balance (in units) at Dec. 31, 2012	130,444	180,225	144,180	34,243	1,802	49,781
Increase (Decrease) in Partners' Capital
Distribution to Partners	(2,922,143)		(2,337,714)	(555,208)	(29,221)
Stock Buyback	(1,021,987)		(819,240)	(192,610)	(10,137)
Stock Buyback (in units)	(905)				9	905
Net Income	5,337,867		4,270,294	1,014,195	53,379
Balance at Sep. 30, 2013	$ (21,121,940)		$ (16,903,742)	$ (4,007,289)	$ (210,908)
Balance (in units) at Sep. 30, 2013	129,539	180,225	144,180	34,243	1,802	50,686