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Indebtedness (Details) (USD $)	0 Months Ended	4 Months Ended		55 Months Ended
Indebtedness (Details) (USD $)	Nov. 06, 2012	Jan. 20, 2013	Jan. 22, 2012	Nov. 05, 2017	Nov. 05, 2012
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 400,000,000
Proceeds from issuance of debt	200,000,000	200,000,000	0
Letters of credit maximum issuance available		75,000,000
Debt instrument, periodic payment, principal				5,000,000
Proceeds from lines of credit	$ 220,000,000
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.25%
Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.75%
Initial Interest Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.00%

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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