Long-Term Debt (GO Zone Bonds) (Details) - Subsequent Event [Member] - Senior Notes [Member] - 2035 GO Zone 6 1/2% Notes [Member]	Nov. 01, 2017 USD ($)
Debt Instrument [Line Items]
Extinguishment of Debt, Amount	$ 250,000
Percentage of principal amount redeemed	100.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Balance Type:	na
Period Type:	duration