Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	3 Months Ended				12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance		$ 2,061,000		$ 2,265,000	$ 2,061,000	$ 2,265,000	$ 4,146,000
Increases related to prior year income tax positions					631,000	32,000	36,000
Increases related to current year income tax positions					441,000	392,000	195,000
Decreases related to prior year income tax positions					(94,000)	0	0
Decreases relating to settlements					0	0	(1,740,000)
Decreases related to expiration of statute of limitations	(300,000)	(100,000)	(100,000)	(600,000)	(319,000)	(628,000)	(372,000)
Unrecognized tax benefits, ending balance	2,720,000		2,061,000		2,720,000	2,061,000	2,265,000
Unrecognized tax benefits that would impact effective tax rate	2,700,000				2,700,000
Expected decrease in unrecognized tax benefits, minimum	300,000				300,000
Expected decrease in unrecognized tax benefits, minimum	$ 400,000				$ 400,000