Long-Term Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Contributions to acquire interest			$ 7,000
Equity (loss) income from non-consolidated real estate businesses	(1,808)	6,804	(256)	7,285
Long-term investments accounted for under the equity method	17,842		17,842		8,595
Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Equity (loss) income from non-consolidated real estate businesses	(273)	846
Hedge Funds [Member]
Schedule of Equity Method Investments [Line Items]
Equity (loss) income from non-consolidated real estate businesses			633	823
Long-term investments accounted for under the equity method	$ 17,842		$ 17,842		$ 8,595