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Commitments And Contingencies Narrative (Details) | 12 Months Ended
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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. + References No definition available. + Details
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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. + References 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 + Details
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