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Revenue (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Capitalized contract costs	$ 16,900	$ 16,900
Minimum [Member]
Estimated life of relevant customer relationship	1 year
Maximum [Member]
Estimated life of relevant customer relationship	5 years

X

- Definition

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

+ Details

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X

- Definition

Estimated life of relevant customer relationship.

+ References

No definition available.

+ Details

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