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	$ (32,481,000)
Stock Buyback (in units)					(111)
Balance at Dec. 31, 2013	(21,848,563)				(218,160)
Balance (in units) at Dec. 31, 2013	129,487	180,225			1,802
Balance at Dec. 31, 2010	(26,920,566)		(21,539,906)	(5,111,627)	(269,033)
Balance (in units) at Dec. 31, 2010	131,484	180,225	144,180	34,243	1,802	48,741
Increase (Decrease) in Partners' Capital
Distribution to Partners	(3,681,566)		(2,945,253)	(699,498)	(36,815)
Net Income	9,291,281		7,433,025	1,765,343	92,913
Balance at Dec. 31, 2011	(21,310,851)		(17,052,134)	(4,045,782)	(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	(3,932,410)		(3,145,928)	(747,158)	(39,324)
Stock Buyback	(906,214)		(726,058)	(171,148)	(9,008)
Stock Buyback (in units)	(1,040)			(198)	(10)	1,040
Net Income	3,633,798		2,907,038	690,422	36,338
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	(3,893,662)		(3,114,930)	(739,796)	(38,936)
Stock Buyback	(1,094,609)		(877,623)	(206,137)	(10,849)
Stock Buyback (in units)	(957)			(182)	(10)	957
Net Income	5,655,385		4,524,308	1,074,523	56,554
Balance at Dec. 31, 2013	$ (21,848,563)		$ (17,485,327)	$ (4,145,076)	$ (218,160)
Balance (in units) at Dec. 31, 2013	129,487	180,225	144,180	34,243	1,802	50,738