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Accounting Pronouncements Recently Issued Narrative - Impact of implementation of new accounting standards (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Sale Leaseback Transaction, Deferred Gain, Net | $ 1,000 |  |
Accounting Standards Update 2016-01 [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 0 |
Accounting Standards Update 2016-09 [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 67
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ (157) |
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | (117)
Common Stock [Member] | Accounting Standards Update 2016-09 [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 184
Minimum [Member] |  |  |
Operating Lease, Right-of-Use Asset | 40,000 |  |
Maximum [Member] |  |  |
Operating Lease, Right-of-Use Asset | $ 50,000 |  |

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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