Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Tax Credit Carryforward [Line Items]
Federal statutory rate	35.00%
Capital loss carryforward	$ 7,108,000	$ 14,718,000
Recognition of tax benefits threshold, likeliness of realization	50.00%
Net increase of unrecognized tax benefits	700,000
Unrecognized tax benefits	4,567,000	3,823,000	6,666,000
Unrecognized tax benefits that would impact effective tax rate	3,600,000	3,000,000
Interest and penalty expense, excluding refunds	106,000	(872,000)	266,000
Accrued interest and penalty	834,000	728,000
Expiring 2014 [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforward	$ 20,300,000