Defined Benefit Pension Plan (Narrative) (Details)	9 Months Ended
Sep. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Tax-deductible contribution for next year	$ 0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated minimum pension contribution	$ 0

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest 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 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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