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Share and Unit-Based Plans: (Tables)

3 Months Ended

Mar. 31, 2012

Share and Unit-Based Plans:

Compensation cost under the share and unit-based plans

		For the Three Months Ended March 31,

		2012			2011
LTIP units		$	1,547		$	1,901
Stock awards			96			493
Stock units			2,220			2,813
SARs			—			321
Phantom stock units			254			240

		$	4,117		$	5,768

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

		LTIP Units						Stock Awards						Phantom Stock						Stock Units

		Units			Value(1)			Shares			Value(1)			Units			Value(1)			Shares			Value(1)
Balance at January 1, 2012			190,000		$	43.30			21,130		$	40.68			15,745		$	34.84			576,340		$	11.71
Granted(2)			285,000			39.61			9,639			54.43			2,134			54.93			72,322			54.43
Vested(2)			(285,000	)		43.30			(9,511	)		35.68			(6,066	)		41.90			(533,985	)		15.24
Forfeited			—			—			—			—			—			—			—

Balance at March 31, 2012			190,000		$	37.77			21,258		$	49.15			11,813		$	34.84			114,677		$	52.19

(1): Value represents the weighted-average grant date fair value.
(2): On February 7, 2012, the compensation committee determined that the LTIP Units granted under the LTIP on February 28, 2011 had vested at the 150% level based on the Company's percentile ranking in terms of Total Return per common stock share to the Total Return of a group of peer REITs during the period of February 1, 2011 to January 31, 2012. As a result, the compensation committee granted an additional 95,000 LTIP Units, which vested as of January 31, 2012.

Summary of activity of SARs and stock options outstanding

		SARs						Stock Options

		Units			Value(1)			Shares			Value(1)
Balance at January 1, 2012			1,156,985		$	56.55			13,500		$	30.08
Granted			—			—			—			—
Exercised			—			—			—			—
Forfeited			—			—			—			—

Balance at March 31, 2012			1,156,985		$	56.55			13,500		$	30.08

(1): Value represents the weighted-average exercise price.