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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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-Publisher FASB
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-Name Regulation S-X (SX)
-Number 210
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

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Financial Instruments (Details) (USD $)	6 Months Ended												3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
Financial Instruments (Details) (USD $)	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2011 Level 1 [Member]	Jun. 30, 2011 Level 2 [Member]	Jun. 30, 2011 Level 3 [Member]	Jun. 30, 2011 Interest Rate Swaps One [Member]	Jun. 30, 2011 Interest Rate Swaps Two [Member]	Mar. 31, 2011 Interest Rate Swaps Two [Member]	Jun. 30, 2011 Interest Rate Swaps Three [Member]	Mar. 31, 2011 Interest Rate Swaps Terminated [Member]	Feb. 28, 2011 Treasury Locks [Member]	Jun. 30, 2011 Euro denominated revolving credit facilities [Member]	Jun. 30, 2010 Euro denominated revolving credit facilities [Member]	Jun. 30, 2011 Euro denominated revolving credit facilities [Member]	Jun. 30, 2010 Euro denominated revolving credit facilities [Member]	Jun. 30, 2011 Canadian denominated revolving credit facilities [Member]	Jun. 30, 2010 Canadian denominated revolving credit facilities [Member]	Jun. 30, 2011 Canadian denominated revolving credit facilities [Member]	Jun. 30, 2010 Canadian denominated revolving credit facilities [Member]	Jun. 30, 2011 Other Liabilities [Member] Interest rate products [Member]	Dec. 31, 2010 Other Liabilities [Member] Interest rate products [Member]	Jun. 30, 2011 Interest rate products [Member]	Jun. 30, 2010 Interest rate products [Member]	Jun. 30, 2011 Interest rate products [Member]	Jun. 30, 2010 Interest rate products [Member]	Jun. 30, 2011 Interest expense [Member]	Jun. 30, 2010 Interest expense [Member]	Jun. 30, 2011 Interest expense [Member]	Jun. 30, 2010 Interest expense [Member]
Company's financial assets and liabilities consist of interest rate swap agreements and marketable securities included in elective deferred compensation plan
Derivative financial instruments	$ 5,600,000			$ 0	$ 5,600,000	$ 0
Marketable Securities	2,900,000			2,900,000	0	0
Debt instruments with carrying value different than estimated fair values
Senior notes, Carrying Amount	2,256,598,000		2,043,582,000
Revolving Credit Facilities and Term Loan Carrying Amount	670,555,000		879,865,000
Mortgage payable and other indebtedness carrying amount	1,286,998,000		1,378,553,000
Long-term Debt, Carrying Amount Total	4,214,151,000		4,302,000,000
Senior notes, Fair Value	2,510,932,000		2,237,320,000
Revolving Credit Facilities and Term Loan Fair Value	673,578,000		875,851,000
Mortgage payable and other indebtedness, Fair Value	1,288,906,000		1,394,393,000
Long-term debt, fair value total	4,473,416,000		4,507,564,000
Information regarding the Swaps
Aggregate Notional Amount							100,000,000	85,000,000	85,000,000	100,000,000	50,000,000	200,000,000
LIBOR Fixed Rate							4.80%	2.80%		1.00%
Maturity date							Feb. 01, 2012	Sep. 01, 2017		Jun. 01, 2014
Net investment hedge derivative instruments on OCI
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)													(900,000)	6,700,000	(3,500,000)	12,400,000	(100,000)	3,100,000	(3,100,000)	(200,000)
Fair value of equity derivative instruments
Liability derivatives, Designated as hedging instruments, Fair value																					5,600,000	5,200,000
Company's derivative instruments on net loss
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion																							(1,000,000)	4,100,000	(2,600,000)	7,600,000
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion																											0	100,000	0	200,000
Financial Instruments (Textuals) [Abstract]
Aggregate Notional Amount							100,000,000	85,000,000	85,000,000	100,000,000	50,000,000	200,000,000
Senior note principal amount		300,000,000
Aggregate payment of treasury locks		2,200,000
Unrealized Loss of hedging instrument	400,000
Approximate Fair value of notes	110,200,000		120,800,000
Carrying amount of notes	110,700,000		122,600,000
Tax Increment Financing Bonds	6,200,000		13,800,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	$ 5,800,000