Long-Term Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments accounted for at cost	$ 32,239	$ 20,788
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments accounted for at cost	32,239	20,788
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investments, fair value disclosure	37,837	25,162
Real estate partnership [Member] | Carrying Value [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments accounted for at cost	698	747
Real estate partnership [Member] | Fair Value [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investments, fair value disclosure	1,102	1,067
Investment partnerships [Member] | Carrying Value [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments accounted for at cost	31,541	20,041
Investment partnerships [Member] | Fair Value [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investments, fair value disclosure	$ 36,735	$ 24,095