Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2011

Debt Instrument [Line Items]

Partnership's Long-Term Debt

Obligations in the form of senior notes and borrowings under the credit facilities are as follows:

	December 31, 2011			December 31, 2010
Senior notes	$	1,355,147		$	856,061
Revolving loans	332,000			285,000
Total	1,687,147			1,141,061
Less: current portion	—			—
Long-term debt	$	1,687,147		$	1,141,061
Availability under revolving credit facility:
Total credit facility limit	$	900,000		$	900,000
Revolving loans	(332,000		)	(285,000		)
Letters of credit	(19,000		)	(16,015		)
Total available	$	549,000		$	598,985

Long-Term Debt Maturities

Long-term debt maturities as of December 31, 2011 for each of the next five years are as follows:

Year Ended December 31,	Amount
2012	$	—
2013	—
2014	332,000
2015	—
2016	250,000
Thereafter	1,100,000
Total	$	1,682,000	*

_______________________

* Excludes an unamortized premium of $5.1 million as of December 31, 2011.

Senior Notes Due 2016 [Member]

Debt Instrument [Line Items]

Senior Note Redemption Price [Table TextBlock]

Beginning June 1, 2013, the Partnership may redeem all or part of these notes at the redemption prices, expressed as percentages of the principal amount, set forth below:

June 1 of year ending:	Percentage of Redemption
2013	104.688%
2014	102.344%
2015 and thereafter	100.000%

Senior Notes Due 2018 [Member]

Debt Instrument [Line Items]

Senior Note Redemption Price [Table TextBlock]

Beginning December 1, 2014, the Partnership may redeem all or part of these notes at the redemption prices, expressed as percentages of the principal amount, set forth below:

December 1 of year ending:	Percentage of Redemption
2014	103.438%
2015	101.719%
2016 and thereafter	100.000%

Senior Notes Due 2021 [Member]

Debt Instrument [Line Items]

Senior Note Redemption Price [Table TextBlock]

Beginning on July 15 of the years indicated below, the Partnership may redeem all or part of the 2021 Notes at the redemption prices, expressed as percentages of the principal amount, set forth below:

July 15 of year ending:	Percentage of Redemption
2016	103.250	%
2017	102.167	%
2018	101.083	%
2019 and thereafter at 100%	100.000	%