Employee Benefits (Details 6) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Benefits and Share-based Compensation, Noncash [Abstract]
Employer contribution	$ 570	$ 0	$ 570	$ 0
Benefits paid	$ (110)	$ (100)	$ (331)	$ (300)

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration