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Revenues (Details)	3 Months Ended
Revenues (Details)	Mar. 31, 2018	Mar. 31, 2017
Revenues [Abstract]
Revenue Recogition, New Accounting Pronouncement, Description	5.6	5.3

Disclosure related to a new accounting pronouncement or a change in accounting principle, including the nature and reason for the change and the effect of the change on prior periods and the current period.

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