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Recent Accounting Pronouncements (Narrative) (Details) - Adoption of ASU 2014-09 (Topic 606) [Member]	6 Months Ended
	Jun. 30, 2018 USD ($)
Recent Accounting Pronouncements
Financial statement impact from adoption	$ 0
Cumulative effect adjustment to opening Retained earnings	$ 0

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- Definition

Represents the quantification of the immaterial effect of adopting the new accounting standard or change in accounting principle by the entity on the entity's financial statements.

+ References

No definition available.

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- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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