Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2011

Share-based compensation plan	Award Classification	Further awards authorized for issuance under plan as of December 31, 2011	Awards outstanding under the plan as of December 31, 2011

2008 Long-Term Incentive Plan ("2008 LTIP")	Equity	Yes	Yes	N/A
2006 Hydrocarbon Stock Incentive Plan ("2006 Hydrocarbon Plan")	Equity	No	No	2010
Long-Term Incentive Plan ("2002 LTIP")	Liability	No	No	2011
1996 Hydrocarbon Stock Incentive Plan ("1996 Hydrocarbon Plan")	Equity	No	No	2009

	Year ended December 31,

	2011		2010		2009
Phantom units	$	13,479	$	15,319	$	7,448
Distribution equivalent rights(1)		446		1,465		1,324

Total compensation expense	$	13,925	$	16,784	$	8,772

(1): A distribution equivalent right is a right, granted in tandem with a specific phantom unit, to receive an amount in cash equal to, and at the same time as, the cash distributions made by the Partnership with respect to a unit during the period such phantom unit is outstanding. Payment of distribution equivalent rights associated with units that are expected to vest are recorded as capital distributions, however, payments associated with units that are not expected to vest are recorded as compensation expense.

2008 LTIP, 2006 Hydrocarbon Plan and 1996 Hydrocarbon Plan

			Weighted-average Grant-date Fair Value(1)

Unvested at January 1, 2009	909,306		$	31.80
Granted	442,035			8.64
Vested	(309,052	)		31.93
Forfeited	(65,048	)		20.96

Unvested at December 31, 2009	977,241			22.00
Granted (includes 282,000 TSR units)	736,688			30.25
Vested	(363,502	)		26.85
Forfeited	(21,267	)		19.28

Unvested at December 31, 2010 (includes 282,000 TSR units)	1,329,160			25.29
Granted (includes 35,250 TSR units)	309,629			42.75
Vested (includes 176,250 TSR units)	(396,934	)		27.04
Forfeited	(306,346	)		31.66

Unvested at December 31, 2011 (includes 141,000 TSR units)(2)	935,509			28.50

(1): The calculation of the weighted average grant-date fair value for units granted during the year ended December 31, 2010 and unvested as of December 2010 and December 2011 is recalculated to include the fair value as of December 31, 2011 for 35,250 TSR Performance Units. A grant date, as defined by GAAP, has not been established for these units.
(2): Includes 141,000 Performance Units that did not vest and were forfeited in January 2012.

2002 LTIP

			Weighted-average Grant-date Fair Value

Unvested at January 1, 2009	145,927		$	31.45
Vested	(69,652	)		29.94
Forfeited	(6,720	)		33.64

Unvested at December 31, 2009	69,555			32.75
Vested	(44,942	)		32.15
Forfeited	(968	)		34.00

Unvested at December 31, 2010	23,645			33.83
Vested	(23,645	)		33.83

Unvested at December 31, 2011	—			—