Unit-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2012

Deferred Compensation Arrangements [Abstract]

Activity of the awards granted to employees and non-employee directors

The following table shows the activity of the awards granted to employees and non-employee directors:



	Number of Units		Weighted Average Grant-Date Fair Value Per Unit
Unvested awards as of December 31, 2011	2,563,709		$	46.37
Awards granted	289,930		43.93
Awards vested	(647,498	)	44.58
Awards forfeited	(346,982	)	44.58
Unvested awards as of December 31, 2012	1,859,159		46.95

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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