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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018
Other Commitments [Line Items] |  |  |  |  |
Actual cash expenditures | $ 1,985 | $ 1,285 | $ 3,296 | $ 3,261 |
Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Actual cash expenditures |  |  |  |  | $ 8,000
Scenario, Forecast [Member] | Maximum [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Actual cash expenditures |  |  |  |  | $ 11,000

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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