Net Income (Loss) Per Common Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
General Partner
Net income (loss) attributable to common shareholders	$	61,494		$	(28,482	)	$	89,537		$	(64,872	)
Less: Dividends on participating securities	(688		)	(856		)	(1,375		)	(1,708		)
Basic net income (loss) attributable to common shareholders	60,806			(29,338		)	88,162			(66,580		)
Noncontrolling interest in earnings of common unitholders	842			—			1,234			—
Diluted net income (loss) attributable to common shareholders	$	61,648		$	(29,338	)	$	89,396		$	(66,580	)
Weighted average number of common shares outstanding	322,489			266,748			318,733			262,556
Weighted average Limited Partner Units outstanding	4,388			—			4,397			—
Other potential dilutive shares	221			—			220			—
Weighted average number of common shares and potential dilutive securities	327,098			266,748			323,350			262,556
Partnership
Net income (loss) attributable to common unitholders	$	62,336		$	(28,948	)	$	90,771		$	(66,149	)
Less: Distributions on participating securities	(688		)	(856		)	(1,375		)	(1,708		)
Basic and diluted net income (loss) attributable to common unitholders	$	61,648		$	(29,804	)	$	89,396		$	(67,857	)
Weighted average number of Common Units outstanding	326,877			271,317			323,130			267,716
Other potential dilutive units	221			—			220			—
Weighted average number of Common Units and potential dilutive securities	327,098			271,317			323,350			267,716

Computation of Anti-Dilutive Common Share

	Three Months Ended June 30,					Six Months Ended June 30,
	2013		2012			2013		2012
General Partner
Noncontrolling interest in loss of common unitholders	$	—	$	(466	)	$	—	$	(1,277	)
Weighted average Limited Partner Units outstanding	—		4,569			—		5,160
General Partner and Partnership
Other potential dilutive shares or units:
Anti-dilutive outstanding potential shares or units under fixed stock option and other stock-based compensation plans	1,373		1,728			1,373		1,728
Outstanding participating securities	3,949		4,047			3,949		4,047