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Preneed Trust Investments (Preneed cemetery trust investment security transactions) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Impairment charge for other-than-temporary declines in fair value | $ 2,300 |  |
Investment income | 5,949 | $ 6,451 | $ 5,315
Decrease (increase) in deferred preneed cemetery receipts held in trust | (5,111) | (6,017) | (5,751)
Preneed Cemetery Trust Investments |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Impairment charge for other-than-temporary declines in fair value |  | 900 |
Investment income | 2,250 | 2,250 | 2,562
Realized gains | 2,218 | 2,141 | 2,952
Realized losses | (2,384) | (6,559) | (3,671)
Expenses and taxes | (1,308) | (1,266) | (1,790)
Decrease (increase) in deferred preneed cemetery receipts held in trust | $ (776) | $ 3,434 | $ (53)

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e25351-111560 + Details
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