Earnings Per Unit (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Reconciliation of numerators and denominators of the basic and diluted per unit computations for net income (loss)

The following table provides a reconciliation of the numerators and denominators of the basic and diluted per unit computations for net income:

	Net Income (Numerator)			Units (Denominator)		Per Unit Amount
	(in thousands)
Three months ended September 30, 2011:
Net income:
Allocated to units	$	837,627
Allocated to unvested restricted units		(8,774	)
	$	828,853
Net income per unit:
Basic net income per unit					174,956	$	4.74
Dilutive effect of unit equivalents					688		(0.02	)
Diluted net income per unit					175,644	$	4.72
Three months ended September 30, 2010:
Net income:
Allocated to units	$	4,143
Allocated to unvested restricted units		(46	)
	$	4,097
Net income per unit:
Basic net income per unit					145,956	$	0.03
Dilutive effect of unit equivalents					502		-
Diluted net income per unit					146,458	$	0.03
Nine months ended September 30, 2011:
Net income:
Allocated to units	$	628,054
Allocated to unvested restricted units		(6,662	)
	$	621,392
Net income per unit:
Basic net income per unit					171,076	$	3.63
Dilutive effect of unit equivalents					749		(0.01	)
Diluted net income per unit					171,825	$	3.62
Nine months ended September 30, 2010:
Net income:
Allocated to units	$	129,239
Allocated to unvested restricted units		(1,361	)
	$	127,878
Net income per unit:
Basic net income per unit					140,598	$	0.91
Dilutive effect of unit equivalents					408		-
Diluted net income per unit					141,006	$	0.91