Property And Equipment (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Property And Equipment [Abstract]
Depreciation and amortization expense	$ 2,151	$ 1,547	$ 6,285	$ 4,596