Employee Benefit Plans - Schedule of Amounts Expected to be Recognized in Net Periodic Benefit Cost (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Net actuarial loss (gain)	$ 29
Other postretirement benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
Net actuarial loss (gain)	$ (77)

Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant