Income Taxes (Narrative) (Details) (USD $)	3 Months Ended			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Tax Liability Not Recognized [Line Items]
Reserve for unrecognized tax benefits				$ (292,000)	$ (623,000)	$ (652,000)
AMT carryforwards				23,029,000	25,765,000
Federal tax credits				0	4,066,000
Operating loss carryforwards, federal				9,300,000	0
Operating loss carryforwards, state				34,600,000	52,500,000
Tax credit carryforwards				0	4,100,000
Operating loss carryforwards, expiration date				2023
Unrecognized tax benefits, if recognized, would favorably affect the effective tax rate				160,000
Interest and penalties				(100,000)	(200,000)	300,000
Interest and penalties, accrued				1,300,000	1,400,000
Uncertain tax position reversal	290,000	620,000	650,000
Interest portion of uncertain tax position reversal	$ 100,000	$ 210,000	$ 50,000
Federal Net Operating Loss [Member]
Deferred Tax Liability Not Recognized [Line Items]
Operating loss carryforwards, expiration date				2032