Marketable Securities and Fair Value Measurements (Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 88,744	$ 98,912
Gross Unrealized Gains	58,370	57,137
Gross Unrealized Losses	(844)	(1,231)
Fair Value	146,270us-gaap_AvailableForSaleSecurities	154,818us-gaap_AvailableForSaleSecurities
Equity Securities, primarily REITs [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	1,405	1,405
Gross Unrealized Gains	499	367
Gross Unrealized Losses
Fair Value	1,904	1,772
Marco OP and OP II Units [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	47,029	51,970
Gross Unrealized Gains	57,088	55,872
Gross Unrealized Losses
Fair Value	104,117	107,842
Corporate Bonds And Preferred Equities [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	35,880	40,705
Gross Unrealized Gains	783	898
Gross Unrealized Losses	(557)	(955)
Fair Value	36,106	40,648
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	4,430	4,832
Gross Unrealized Gains
Gross Unrealized Losses	(287)	(276)
Fair Value	$ 4,143	$ 4,556

Amount of unrealized gain before deducting unrealized loss on investments in equity securities classified as available-for-sale securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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