Prepaids And Other Current Assets (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Prepaid and Other Current Assets [Line Items]
Insurance recovery receivable	$ 993,000	$ 601,000
Securities-Law Civil Actions And A Governmental Interaction [Member]
Prepaid and Other Current Assets [Line Items]
Cumulative legal fees and costs	12,100,000	9,700,000
Legal fees and costs	2,400,000	900,000	2,600,000
Insurance reimbursements	7,900,000	5,900,000
Estimated gross insurance recoveries	$ 2,400,000	$ 900,000	$ 700,000