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Long-Term Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Long-Term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments at cost	$ 46,219		$ 46,219		$ 40,292
Long-term investments	46,219		46,219		40,292
Equity income (loss) from real estate ventures	1,856	$ (1,808)	2,194	$ (256)
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments at cost	37,091		37,091		32,239
Carrying Value \| Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments at cost	37,091		37,091		32,239
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investments, fair value disclosure	46,855		46,855		39,147
Real estate partnership \| Carrying Value \| Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments at cost	551		551		698
Real estate partnership \| Fair Value \| Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investments, fair value disclosure	762		762		1,108
Investment partnerships
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment partnership accounted for under the equity method	9,128		9,128		8,053
Equity income (loss) from real estate ventures	(1,657)	$ (273)	(1,694)	$ 633
Investment partnerships \| Carrying Value \| Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments at cost	36,540		36,540		31,541
Investment partnerships \| Fair Value \| Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investments, fair value disclosure	$ 46,093		$ 46,093		$ 38,039