Derivative and Other Fair Value Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Derivative and Other Fair Value Instruments [Abstract]

Derivative Instrument Table

	Fair Value Hedges (1)			Forward Starting 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 fair value financial instruments measured on recurring basis and their location in the statement of financial position

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	9/30/2011		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level  3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	10,581	$	—	$	10,581	$	—
Supplemental Executive Retirement Plan	Other Assets		66,444		66,444		—		—
Available-for-Sale Investment Securities	Other Assets		1,505		1,505		—		—
Total		$	78,530	$	67,949	$	10,581	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	166,169	$	—	$	166,169	$	—
Supplemental Executive Retirement Plan	Other Liabilities		66,444		66,444		—		—
Total		$	232,613	$	66,444	$	166,169	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	378,798	$	—	$	378,798	$	—

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	12/31/2010		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	12,521	$	—	$	12,521	$	—
Forward Starting Swaps	Other Assets		3,276		—		3,276		—
Supplemental Executive Retirement Plan	Other Assets		58,132		58,132		—		—
Available-for-Sale Investment Securities	Other Assets		1,194		1,194		—		—
Total		$	75,123	$	59,326	$	15,797	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	37,756	$	—	$	37,756	$	—
Development Cash Flow Hedges	Other Liabilities		1,322		—		1,322		—
Supplemental Executive Retirement Plan	Other Liabilities		58,132		58,132		—		—
Total		$	97,210	$	58,132	$	39,078	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	383,540	$	—	$	383,540	$	—

Schedule of Location of Fair Value Hedges on Statement of Operations

September 30, 2011 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative			Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	(1,940	)		Fixed rate debt		Interest expense	$	1,940
Total			$	(1,940	)					$	1,940

September 30, 2010 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative		Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	9,842		Fixed rate debt		Interest expense	$	(9,842	)
Total			$	9,842					$	(9,842	)

Schedule of Location of Cash flow Hedges on Statement of Operations

	Effective Portion							Ineffective Portion
September 30, 2011 Type of Cash Flow Hedge	Amount of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(131,689	)	Interest expense	$	(2,842	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,322		Interest expense		—			N/A		—
Total	$	(130,367	)		$	(2,842	)			$	—

	Effective Portion							Ineffective Portion
September 30. 2010 Type of Cash Flow Hedge	Amount  of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(124,908	)	Interest expense	$	(2,379	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,436		Interest expense		—			N/A		—
Total	$	(123,472	)		$	(2,379	)			$	—

Schedule of Available for Sale and Held to Maturity Securities

		Other Assets
Security	Maturity	Amortized Cost		Unrealized Gains		Unrealized Losses		Book/ Fair Value		Interest and Other Income
Available-for-Sale Investment Securities	N/A	$	675	$	830	$	—	$	1,505	$	—
Total		$	675	$	830	$	—	$	1,505	$	—