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Employee Benefit Plans (Narrative) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 5.0
Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | 10.0
Minimum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | $ 8.0

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- Definition 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. + References 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 + Details
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