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Receivables from Preneed Trusts Receivables from Preneed Trusts (Composition of Asset Held in Trusts) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Historical Cost Basis |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | $ 15,759 | $ 14,658
Historical Cost Basis | Cash and Cash Equivalents |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 3,903 | 3,378
Historical Cost Basis | Fixed Income Investments |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 9,306 | 8,809
Historical Cost Basis | Mutual Funds And Common Stocks |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 2,544 | 2,455
Historical Cost Basis | Annuities |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 6 | 16
Fair Value |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 15,782 | 14,666
Fair Value | Cash and Cash Equivalents |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 3,903 | 3,378
Fair Value | Fixed Income Investments |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 9,306 | 8,809
Fair Value | Mutual Funds And Common Stocks |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | 2,567 | 2,463
Fair Value | Annuities |  |
Investment Holdings [Line Items] |  |
Assets Held-in-trust | $ 6 | $ 16

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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