Fair Value Measurements and Disclosures Concentration of Risk (Details) (USD $)	Sep. 30, 2014
Concentration Risk [Line Items]
Fair Value of Derivative Assets	$ 27,186,000
Number of derivative counterparties not lenders in our revolving credit facility	26
Canadian Imperial Bank of Commerce [Member]
Concentration Risk [Line Items]
Fair Value of Derivative Assets	7,171,000	[1]
JPMorgan Chase Bank [Member]
Concentration Risk [Line Items]
Fair Value of Derivative Assets	5,812,000	[1]
Wells Fargo Bank [Member]
Concentration Risk [Line Items]
Fair Value of Derivative Assets	5,343,000	[1]
Bank of Nova Scotia [Member]
Concentration Risk [Line Items]
Fair Value of Derivative Assets	3,470,000	[1]
Key Bank [Member]
Concentration Risk [Line Items]
Fair Value of Derivative Assets	2,540,000	[1]
Other Lenders in Our Credit Facility [Member]
Concentration Risk [Line Items]
Fair Value of Derivative Assets	2,844,000
Various [Member]
Concentration Risk [Line Items]
Fair Value of Derivative Assets	$ 6,000	[2]

[1] Major lender in our revolving credit facility. See Note 7, Long-Term Debt.

[2] Represents a total of 26 counterparties.