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Accounting Policies (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy |  | $ 0
Operating leases (less than) | $ 2,200 |
Accounting Standards Update 2014-09 |  |
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy |  | $ (102)

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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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