Fair Value Measurements (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Assets:
Non cash loss on impairment of long lived asset	$ 4,457
Recognized realized losses on sale of marketable securities		22
Schedule of Available-for-sale Securities [Line Items]
Current balance of the secured convertible note	2,475	2,475
Estimated fair value of mortgage and other indebtedness	5,619,338	5,619,338	5,709,860
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Available-for-sale securities	23,853	23,853	22,052
Privately held debt and equity securities	0	0	0
Interest rate cap	0	0	0
Long-lived assets	0	0
Interest rate swaps	0	0
Schedule of Available-for-sale Securities [Line Items]
Fair Value	23,853	23,853	22,052
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Available-for-sale securities	0	0	0
Privately held debt and equity securities	0	0	0
Interest rate cap	3	3	3
Long-lived assets	0	0
Interest rate swaps	2,099	2,099
Schedule of Available-for-sale Securities [Line Items]
Fair Value	0	0	0
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Available-for-sale securities	0	0	0
Privately held debt and equity securities	2,475	2,475	2,475
Interest rate cap	0	0	0
Long-lived assets	14,873	14,873
Interest rate swaps	0	0
Schedule of Available-for-sale Securities [Line Items]
Fair Value	0	0	0
Total Losses [Member]
Assets:
Long-lived assets	4,457	4,457
Fair Value, Measurements, Recurring [Member]
Assets:
Available-for-sale securities	23,853	23,853	22,052
Privately held debt and equity securities	2,475	2,475	2,475
Interest rate cap	3	3	3
Long-lived assets	14,873	14,873
Interest rate swaps	2,099	2,099
Schedule of Available-for-sale Securities [Line Items]
Fair Value	23,853	23,853	22,052
Common Stock [Member]
Assets:
Available-for-sale securities	14,192	14,192	12,550
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	4,207	4,207	4,207
Gross Unrealized Gains	9,987	9,987	8,347
Gross Unrealized Losses	(2)	(2)	(4)
Fair Value	14,192	14,192	12,550
Mutual funds [Member]
Assets:
Available-for-sale securities	5,508	5,508	5,316
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	5,359	5,359	5,318
Gross Unrealized Gains	149	149	37
Gross Unrealized Losses	0	0	(39)
Fair Value	5,508	5,508	5,316
Mortgage/asset-backed securities [Member]
Assets:
Available-for-sale securities	1,895	1,895	1,565
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	1,884	1,884	1,571
Gross Unrealized Gains	11	11	0
Gross Unrealized Losses	0	0	(6)
Fair Value	1,895	1,895	1,565
Government and government sponsored entities [Member]
Assets:
Available-for-sale securities	1,499	1,499	1,861
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	1,489	1,489	1,864
Gross Unrealized Gains	10	10	8
Gross Unrealized Losses	0	0	(11)
Fair Value	1,499	1,499	1,861
Corporate bonds [Member]
Assets:
Available-for-sale securities	725	725	728
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	703	703	710
Gross Unrealized Gains	22	22	18
Gross Unrealized Losses	0	0	0
Fair Value	725	725	728
International bonds [Member]
Assets:
Available-for-sale securities	34	34	32
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	34	34	32
Gross Unrealized Gains			0
Gross Unrealized Losses	0	0	0
Fair Value	$ 34	$ 34	$ 32

Fair value of long-lived assets that are held for sale apart from normal operations at balance sheet date.

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Carrying value as of the balance sheet date of the portion of other assets Secured Convertible Notes Receivable. Secured Convertible Notes Receivable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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