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Commitments And Contingencies Narrative (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total rental expense for long-term operating leases	$ 370,000
Collateralized letters of credit outstanding related to insurance and reinsurance contracts	$ 5,700,000

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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