Long Term Investments Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 6,432	$ 16,499
Equity Method Investments [Roll Forward]
Reduction in partnership interest now accounted for under the cost method	15,541	0
Equity loss on long-term investments accounted for under the equity method	29,764	19,966	23,963
Hedge Funds [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	6,432	16,499
Equity Method Investments [Roll Forward]
Equity Method Investments, Beginning Balance	16,499	10,954
Contributions	5,000	10,000
Reduction in partnership interest now accounted for under the cost method	(15,541)	0
Equity loss on long-term investments accounted for under the equity method	(1,261)	(859)
Unrealized gains reclassified into net income	0	0
Unrealized (loss) gain on long-term investments	1,735	(3,596)
Net change in long-term investments	1,735	(3,596)
Equity Method Investments, Ending Balance	$ 6,432	$ 16,499