Interest Rate Swaps (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2012 Swap	Dec. 31, 2011
Summary of Derivative Instruments by Risk Exposure [Line Items]
Number of interest rate swap agreements	5
Notional amount of interest rate swap agreements	$ 50,000,000
Unrealized loss recognized in OCI	400,000
Unrealized loss recognized on statement of operations	0	0
3.4% Interest Rate Swaps Due 2014 [Member]
Summary of Derivative Instruments by Risk Exposure [Line Items]
Outstanding credit facility	$ 250,000,000
Interest rate fixed as result of interest rate swap hedges	3.40%