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Share and Unit-Based Plans: (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Compensation cost under the share and unit-based plans

The following summarizes the compensation cost under the share and unit-based plans:



	For the Three Months Ended June 30,								For the Six Months Ended June 30,
	2014				2013				2014				2013
LTIP Units	$	3,428			$	4,692			$	21,668			$	7,650
Stock awards	83				122				197				232
Stock units	1,039				667				2,721				2,491
Stock options	4				4				8				8
Phantom stock units	300				246				606				487
	$	4,854			$	5,731			$	25,200			$	10,868

Summary of activity of non-vested LTIP Units, stock awards, phantom stock and stock units

The following table summarizes the activity of the non-vested LTIP Units, stock awards, phantom stock units and stock units:



	LTIP Units							Stock Awards							Phantom Stock Units							Stock Units
	Units			Value(1)				Shares			Value(1)				Units			Value(1)				Units			Value(1)
Balance at January 1, 2014	—			$	—			19,001			$	56.77			17,575			$	58.66			137,318			$	57.24
Granted	589,443			53.18				—			—				7,451			61.78				70,389			60.23
Vested	(246,471	)		60.25				(9,812	)		54.45				(9,771	)		60.91				(68,035	)		55.08
Forfeited	—			—				—			—				—			—				—			—
Balance at June 30, 2014	342,972			$	48.11			9,189			$	59.25			15,255			$	58.74			139,672			$	59.80


(1)	Value represents the weighted average grant date fair value.

Summary of activity of SARs and stock options outstanding

The following table summarizes the activity of the stock appreciations rights ("SARs") and stock options outstanding:



	SARs							Stock Options
	Shares			Value(1)				Shares			Value(1)
Balance at January 1, 2014	1,070,991			$	56.66			10,068			$	59.57
Granted	—			—				—			—
Exercised	(5,000	)		56.63				—			—
Forfeited	—			—				—			—
Balance at June 30, 2014	1,065,991			$	56.66			10,068			$	59.57


(1)	Value represents the weighted average exercise price.