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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-Topic 420
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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Tabular disclosure of maturity and sinking fund requirement for long-term debt.

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