Derivative and Other Fair Value Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Derivative and Other Fair Value Instruments (Tables) [Abstract]

Derivative Instrument Table

	Fair Value Hedges (1)			Forward Starting Swaps (2)
Current Notional Balance	$	300,000		$	200,000
Lowest Possible Notional	$	300,000		$	200,000
Highest Possible Notional	$	300,000		$	200,000
Lowest Interest Rate	2.009		%	3.478		%
Highest Interest Rate	2.637		%	4.695		%
Earliest Maturity Date	2013			2023
Latest Maturity Date	2013			2023

Schedule of Location and Amount of Financial Instruments on Balanace Sheet

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	9/30/2012		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	$	3,038	$	—	$	3,038	$	—
Supplemental Executive Retirement Plan	Other Assets	69,369		69,369		—		—
Available-for-Sale Investment Securities	Other Assets	1,944		1,944		—		—
Total		$	74,351	$	71,313	$	3,038	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	44,615	$	—	$	44,615	$	—
Supplemental Executive Retirement Plan	Other Liabilities	69,369		69,369		—		—
Total		$	113,984	$	69,369	$	44,615	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	414,219	$	—	$	414,219	$	—

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	12/31/2011		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	$	8,972	$	—	$	8,972	$	—
Supplemental Executive Retirement Plan	Other Assets	71,426		71,426		—		—
Available-for-Sale Investment Securities	Other Assets	1,550		1,550		—		—
Total		$	81,948	$	72,976	$	8,972	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	32,278	$	—	$	32,278	$	—
Supplemental Executive Retirement Plan	Other Liabilities	71,426		71,426		—		—
Total		$	103,704	$	71,426	$	32,278	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	416,404	$	—	$	416,404	$	—

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]

September 30, 2012 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	$	(5,934	)	Fixed rate debt	Interest expense	$	5,934
Total		$	(5,934	)			$	5,934

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

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

	Effective Portion							Ineffective Portion
September 30, 2012 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	$	(12,337	)	Interest expense	$	(10,907	)	N/A	$	—
Total	$	(12,337	)		$	(10,907	)		$	—

	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	)		$	—

Available-for-sale Securities [Table Text Block]

		Other Assets
September 30, 2012 Security	Maturity	Amortized Cost		Unrealized Gains		Unrealized Losses		Book/ Fair Value		Interest and Other Income
Available-for-Sale Investment Securities	N/A	$	675	$	1,269	$	—	$	1,944	$	—
Total		$	675	$	1,269	$	—	$	1,944	$	—

		Other Assets
December 31, 2011 Security	Maturity	Amortized Cost		Unrealized Gains		Unrealized Losses		Book/ Fair Value		Interest and Other Income
Available-for-Sale Investment Securities	N/A	$	675	$	875	$	—	$	1,550	$	—
Total		$	675	$	875	$	—	$	1,550	$	—