Benefit Plans - Project Benefit Payment Obligations (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Retirement Benefits [Abstract]
2019	$ 1,140
2020	1,260
2021	1,130
2022	1,200
2023	1,270
Thereafter	7,460
Total	$ 13,460
Fair value assumptions, expected term	10 years

Defined Benefit Plan, Expected Future Benefit Payments, Total

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- Definition

Defined Benefit Plan, Fair Value Assumptions, Expected Term

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- Definition

Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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- Definition

Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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- Definition

Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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