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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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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

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