Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal statutory rate	35.00%
AMT credit carryforward balance	$ 31,200,000	$ 39,200,000
Net increase of unrecognized tax benefits	1,800,000
Unrecognized tax benefits	12,612,000	10,784,000	5,926,000
Unrecognized tax benefits that would impact effective tax rate	11,100,000	8,400,000
Interest and penalty expense, excluding refunds	739,000	1,119,000	111,000
Accrued interest and penalty	$ 2,803,000	$ 2,065,000