Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal statutory rate	35.00%
Recognition of tax benefits threshold, likeliness of realization	50.00%
Net increase of unrecognized tax benefits	$ 0
Unrecognized tax benefits	5,926,000	4,567,000	3,823,000
Unrecognized tax benefits that would impact effective tax rate	3,500,000	3,600,000
Interest and penalty expense, excluding refunds	111,000	106,000	(872,000)
Accrued interest and penalty	$ 945,000	$ 834,000