UNIT-BASED COMPENSATION PLANS (Tables)

12 Months Ended

Dec. 31, 2011

The following table sets forth the LTIP activity for the periods indicated (dollars in thousands):


	Number of LP Units			Weighted Average Grant Date Fair Value per LP Unit (1)		Total Value
Unvested at January 1, 2010		140,095		$	39.81	$	5,577
Granted		259,336			56.26		14,590
Vested		(18,642	)		39.20		(731	)
Forfeited		(15,876	)		49.50		(786	)

Unvested at December 31, 2010		364,913		$	51.11	$	18,650

Granted		251,184		$	64.88	$	16,296
Vested		(17,553	)		55.53		(975	)
Forfeited		(13,227	)		57.03		(754	)

Unvested at December 31, 2011		585,317		$	56.75	$	33,217

(1)	Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. The weighted-average grant date fair value per LP Unit for forfeited and vested awards is determined before an allowance for forfeitures.

Summary of Changes in the LP Unit Options Outstanding, All of which are Vested or Expected to Vest, Under the Option Plan

The following is a summary of the changes in the options outstanding (all of which are vested) under the Option Plan for the periods indicated (dollars in thousands):


	Number of LP Units			Weighted- Average Strike Price ($/LP Unit)		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (1)
Outstanding at January 1, 2010		349,400		$	46.25
Exercised		(107,900	)		44.41
Forfeited, cancelled or expired		300			58.96

Outstanding at December 31, 2010		241,800			47.04		5.8	$	4,785
Exercised		(144,800	)		47.10

Outstanding at December 31, 2011		97,000			46.81		4.2	$	1,666


Exercisable at December 31, 2011		97,000		$	46.81		4.2	$	1,666

(1)	Aggregate intrinsic value reflects fully vested LP Unit options at the date indicated. Intrinsic value is determined by calculating the difference between our closing LP Unit price on the last trading day in 2011 and the exercise price, multiplied by the number of exercisable, in-the-money options.

Override Units

Fair Value Assumptions

The following assumptions were used for grants during the period:


	Year Ended December 31,
	2011 (1)			2010 (2)		2009 (3)
Current equity value (in millions)	$	410.70		$	—	$	439.06
Expected life in years		1.0			—		3.4
Risk-free interest rate		0.3	%		—		1.8	%
Volatility		0.25			—		0.45

(1)	The assumptions were used for grants of the Value N-1 and N-2 Units during the period.

(2)	There were no override units granted during the year ended December 31, 2010.

(3)	The assumptions were used for grants of the Value A, Value B, and Operating Units during the period.