Long Term Investments Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity Method Investments [Roll Forward]
Equity loss on long-term investments accounted for under the equity method	$ 4,103	$ 22,925	$ 29,764
Investment partnerships [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	8,053	8,595
Equity Method Investments [Roll Forward]
Equity Method Investments, Beginning Balance	8,595	6,432
Equity loss on long-term investments accounted for under the equity method	1,242	2,066
Unrealized (loss) gain on long-term investments	(1,784)	97
Net change in long-term investments	(1,784)	97
Equity Method Investments, Ending Balance	$ 8,053	$ 8,595