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Share and Unit-Based Plans: (Tables)

6 Months Ended

Jun. 30, 2013

Share and Unit-Based Plans:

Compensation cost under the share and unit-based plans

		For the Three Months Ended June 30,						For the Six Months Ended June 30,
		2013			2012			2013			2012
LTIP Units		$	4,692		$	2,321		$	7,650		$	3,868
Stock awards			122			124			232			220
Stock units			667			383			2,491			2,603
Stock options			4			—			8			—
SARs			—			82			—			82
Phantom stock units			246			255			487			509
		$	5,731		$	3,165		$	10,868		$	7,282

Summary of activity of non-vested LTIP Units, stock awards, phantom stock 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, 2013			200,000		$	38.63			20,924		$	49.36			—		$	—			114,677		$	52.19
Granted			332,189			49.67			8,963			61.84			28,446			58.92			67,920			62.01
Vested			(200,000	)		38.63			(10,886	)		46.70			(8,081	)		60.35			(45,279	)		51.29
Forfeited			—			—			—			—			—			—			—			—
Balance at June 30, 2013			332,189		$	49.67			19,001		$	56.77			20,365		$	58.36			137,318		$	57.24

(1)

Value represents the weighted-average grant date fair value.

Summary of activity of SARs and stock options outstanding

		SARs						Stock Options
		Shares			Value(1)			Shares			Value(1)
Balance at January 1, 2013			1,164,185		$	56.66			12,768		$	54.69
Granted			—			—			—			—
Exercised			(93,194	)		56.63			—			—
Forfeited			—			—			—			—
Balance at June 30, 2013			1,070,991		$	56.66			12,768		$	54.69

(1)

Value represents the weighted-average exercise price.

X

- Definition

Tabular disclosure of the changes in outstanding nonvested Long-Term Incentive Plan ("LTIP") units, stock awards, phantom stock and stock units.

+ References

No definition available.

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- Definition

Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

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