Summary Of Significant Accounting Policies (Major Customers And Concentration Of Credit Risk) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Total revenue	$ 34,022	$ 50,782	$ 85,452	$ 136,088
Accounts Receivable [Member]
Concentration risk, percentage	92.00%		92.00%
Concentration risk, benchmark percentage	10.00%		10.00%
Total Revenue [Member]
Concentration risk, benchmark percentage	10.00%		10.00%
Total Revenue [Member] | Customer A [Member]
Concentration risk, percentage	48.10%		48.10%
Total Revenue [Member] | Customer B [Member]
Concentration risk, percentage	11.00%		11.00%
Total Revenue [Member] | Customer C [Member]
Concentration risk, percentage	10.90%		10.90%