Derivative and Other Fair Value Instruments (Tables)

6 Months Ended

Jun. 30, 2011

Derivative and Other Fair Value Instruments [Abstract]

Derivative Instrument Table

				Forward
	Fair Value			Starting
	Hedges (1)			Swaps (2)
Current Notional Balance	$	315,693		$	950,000
Lowest Possible Notional	$	315,693		$	950,000
Highest Possible Notional	$	317,694		$	950,000
Lowest Interest Rate		2.009	%		3.478	%
Highest Interest Rate		4.800	%		4.695	%
Earliest Maturity Date		2012			2021
Latest Maturity Date		2013			2023

(1)	Fair Value Hedges — Converts outstanding fixed rate debt to a floating interest rate.
(2)	Forward Starting Swaps — Designed to partially fix the interest rate in advance of a planned future debt issuance. These swaps have mandatory counterparty terminations from 2012 through 2014, and $750.0 million and $200.0 million are targeted to 2012 and 2013 issuances, respectively.

Schedule of Location of Derivatives on Balance Sheet

	Asset Derivatives			Liability Derivatives
	Balance Sheet			Balance Sheet
June 30, 2011	Location	Fair Value		Location	Fair Value
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other assets	$	11,794	Other liabilities	$	—
Forward Starting Swaps	Other assets		2,029	Other liabilities		65,519
Total		$	13,823		$	65,519

	Asset Derivatives			Liability Derivatives
	Balance Sheet			Balance Sheet
December 31, 2010	Location	Fair Value		Location	Fair Value
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other assets	$	12,521	Other liabilities	$	—
Forward Starting Swaps	Other assets		3,276	Other liabilities		37,756
Development Cash Flow Hedges	Other assets		—	Other liabilities		1,322
Total		$	15,797		$	39,078

Schedule of Location of Fair Value Hedges on Statement of Operations

	Location of Gain/(Loss)	Amount of Gain/(Loss)				Income Statement	Amount of Gain/(Loss)
June 30, 2011	Recognized in Income	Recognized in Income				Location of Hedged	Recognized in Income
Type of Fair Value Hedge	on Derivative	on Derivative			Hedged Item	Item Gain/(Loss)	on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps	Interest expense	$	(727	)	Fixed rate debt	Interest expense	$	727
Total		$	(727	)			$	727
	Location of Gain/(Loss)	Amount of Gain/(Loss)				Income Statement	Amount of Gain/(Loss)
June 30, 2011	Recognized in Income	Recognized in Income				Location of Hedged	Recognized in Income
Type of Fair Value Hedge	on Derivative	on Derivative			Hedged Item	Item Gain/(Loss)	on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps	Interest expense	$	7,009		Fixed rate debt	Interest expense	$	(7,009	)
Total		$	7,009				$	(7,009	)

Schedule of Location of Cash flow Hedges on Statement of Operations

Effective Portion

Ineffective Portion

Location of

Amount of

Amount of

Gain/(Loss)

Gain/(Loss)

Location of

Amount of Gain/(Loss)

Gain/(Loss)

Reclassified from

Reclassified from

Gain/(Loss)

Reclassified from

June 30, 2011

Recognized in OCI

Accumulated OCI

Accumulated OCI

Recognized in Income

Accumulated OCI

Type of Cash Flow Hedge

on Derivative

into Income

into Income

on Derivative

into Income

Derivatives designated as hedging instruments:

Interest Rate Contracts:

Forward Starting Swaps/Treasury Locks

$

(26,441

)

Interest expense

$

(1,891

)

Interest expense

$

(2,569

)

Development Interest Rate Swaps/Caps

1,322

Interest expense

—

N/A

—

Total

$

(25,119

)

$

(1,891

)

$

(2,569

)

	Effective Portion							Ineffective Portion
				Location of	Amount of
	Amount of			Gain/(Loss)	Gain/(Loss)			Location of		Amount of Gain/(Loss)
	Gain/(Loss)			Reclassified from	Reclassified from			Gain/(Loss)		Reclassified from
June 30, 2010	Recognized in OCI			Accumulated OCI	Accumulated OCI			Recognized in Income		Accumulated OCI
Type of Cash Flow Hedge	on Derivative			into Income	into Income			on Derivative		into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(86,530	)	Interest expense	$	(1,465	)		N/A	$	—
Development Interest Rate Swaps/Caps		784		Interest expense		—			N/A		—
Total	$	(85,746	)		$	(1,465	)			$	—

Schedule of Available for Sale and Held to Maturity Securities

		Other Assets
		Amortized		Unrealized		Unrealized		Book/		Interest and
Security	Maturity	Cost		Gains		Losses		Fair Value		Other Income
Available-for-Sale Investment Securities	N/A	$	675	$	1,012	$	—	$	1,687	$	—
Total		$	675	$	1,012	$	—	$	1,687	$	—

Assets and liabilities measured on recurring basis

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in
			Active Markets for		Significant Other		Significant
			Identical Assets/Liabilities		Observable Inputs		Unobservable Inputs
Description	6/30/2011		(Level 1)		(Level 2)		(Level 3)
Assets
Derivatives	$	13,823	$	—	$	13,823	$	—
Supplemental Executive Retirement Plan		57,776		57,776		—		—
Available-for-Sale Investment Securities		1,687		1,687		—		—
Total	$	73,286	$	59,463	$	13,823	$	—
Liabilities
Derivatives	$	65,519	$	—	$	65,519	$	—
Supplemental Executive Retirement Plan		57,776		57,776		—		—
Total	$	123,295	$	57,776	$	65,519	$	—
Redeemable Noncontrolling Interests — Operating Partnership/Redeemable Limited Partners	$	438,141	$	—	$	438,141	$	—

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in
			Active Markets for		Significant Other		Significant
			Identical Assets/Liabilities		Observable Inputs		Unobservable Inputs
Description	12/31/2010		(Level 1)		(Level 2)		(Level 3)
Assets
Derivatives	$	15,797	$	—	$	15,797	$	—
Supplemental Executive Retirement Plan		58,132		58,132		—		—
Available-for-Sale Investment Securities		1,194		1,194		—		—
Total	$	75,123	$	59,326	$	15,797	$	—
Liabilities
Derivatives	$	39,078	$	—	$	39,078	$	—
Supplemental Executive Retirement Plan		58,132		58,132		—		—
Total	$	97,210	$	58,132	$	39,078	$	—
Redeemable Noncontrolling Interests — Operating Partnership/Redeemable Limited Partners	$	383,540	$	—	$	383,540	$	—