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Preneed Trust Investments Preneed Trust Investments (Unrealized losses on cemetery merchandise and service trust investments) (Details) - Preneed Cemetery Trust Investments - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | $ 12,806 | $ 15,566
Unrealized Losses, In Loss Position Less than12 months | (1,616) | (745)
Fair market value, In Loss Position Greater than12 months | 12,361 | 20,056
Unrealized Losses, In Loss Position Greater than12 months | (1,933) | (3,827)
Fair market value, Total | 25,167 | 35,622
Unrealized Losses, Total | (3,549) | (4,572)
Municipal bonds |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months |  | 228
Unrealized Losses, In Loss Position Less than12 months |  | (4)
Fair market value, In Loss Position Greater than12 months |  | 0
Unrealized Losses, In Loss Position Greater than12 months |  | 0
Fair market value, Total |  | 228
Unrealized Losses, Total |  | (4)
Foreign debt |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 151 | 2,523
Unrealized Losses, In Loss Position Less than12 months | (6) | (180)
Fair market value, In Loss Position Greater than12 months | 1,637 | 2,868
Unrealized Losses, In Loss Position Greater than12 months | (187) | (475)
Fair market value, Total | 1,788 | 5,391
Unrealized Losses, Total | (193) | (655)
Corporate debt |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 3,735 | 6,939
Unrealized Losses, In Loss Position Less than12 months | (72) | (233)
Fair market value, In Loss Position Greater than12 months | 846 | 2,168
Unrealized Losses, In Loss Position Greater than12 months | (201) | (890)
Fair market value, Total | 4,581 | 9,107
Unrealized Losses, Total | (273) | (1,123)
Preferred stock |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 48 | 3,217
Unrealized Losses, In Loss Position Less than12 months | 0 | (121)
Fair market value, In Loss Position Greater than12 months | 8,109 | 11,635
Unrealized Losses, In Loss Position Greater than12 months | (588) | (826)
Fair market value, Total | 8,157 | 14,852
Unrealized Losses, Total | (588) | (947)
Mortgage-backed securities |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 127 | 51
Unrealized Losses, In Loss Position Less than12 months | (15) | (5)
Fair market value, In Loss Position Greater than12 months | 27 | 0
Unrealized Losses, In Loss Position Greater than12 months | (9) | 0
Fair market value, Total | 154 | 51
Unrealized Losses, Total | (24) | (5)
Common stock |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 8,249 | 2,608
Unrealized Losses, In Loss Position Less than12 months | (1,512) | (202)
Fair market value, In Loss Position Greater than12 months | 1,742 | 3,385
Unrealized Losses, In Loss Position Greater than12 months | (948) | (1,636)
Fair market value, Total | 9,991 | 5,993
Unrealized Losses, Total | (2,460) | $ (1,838)
Mutual Fund [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 496 |
Unrealized Losses, In Loss Position Less than12 months | (11) |
Fair market value, In Loss Position Greater than12 months | 0 |
Unrealized Losses, In Loss Position Greater than12 months | 0 |
Fair market value, Total | 496 |
Unrealized Losses, Total | $ (11) |

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