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Share and Unit-Based Plans: (Tables)

6 Months Ended

Jun. 30, 2015

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,
	2015				2014				2015				2014
LTIP Units	$	3,770			$	3,428			$	18,998			$	21,668
Stock awards	122				83				197				197
Stock units	1,136				1,039				4,333				2,721
Stock options	4				4				8				8
Phantom stock units	268				300				579				606
	$	5,300			$	4,854			$	24,115			$	25,200

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, 2015	46,695			$	58.89			9,189			$	59.25			9,269			$	58.35			144,374			$	59.94
Granted	368,508			75.98				—			—				5,460			83.19				76,340			86.64
Vested	(132,607	)		86.72				(7,410	)		58.65				(8,238	)		71.61				(84,307	)		61.11
Forfeited	—			—				—			—				(2,458	)		55.62				—			—
Balance at June 30, 2015	282,596			$	68.12			1,779			$	61.72			4,033			$	66.54			136,407			$	74.66


(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, 2015	772,639			$	56.67			10,068			$	59.57
Granted	—			—				—			—
Exercised	(343,981	)		56.88				—			—
Forfeited	—			—				—			—
Balance at June 30, 2015	428,658			$	56.50			10,068			$	59.57


(1)	Value represents the weighted average exercise price.