Employee Benefit Plans - Narrative (Details)	Mar. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Anticipated cash contributions to pension plan in remaining fiscal year	$ 0
Estimated liability to withdraw from plan	3,239,000
Estimated liability to withdraw from plan, current	240,000
Estimated liability to withdraw from plan, noncurrent	$ 2,999,000

Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920

Name:	us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant