Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands	12 Months Ended
	Dec. 31, 2010
Long-Term Equity Investments [Member]
Balance sheet reclassified amount	$ (3,241)
Deferred Rent Liability [Member]
Balance sheet reclassified amount	10,358
Deferred Revenue, Non-Current [Member]
Balance sheet reclassified amount	2,517
Accrued Exit Expenses, Non-Current [Member]
Balance sheet reclassified amount	$ 700