Contingencies and Gain on Sale of Assets (Tables)	6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Other Assets and Other Liabilities

Tabular disclosure of assets and liabilities, classified as other.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration