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Cemetery Perpetual Care Trust Investments Cemetery Perpetual Care Trust Investments (Unrealized losses on perpetual care trust investments) (Details) - Perpetual Care Trust Invesments - 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 | $ 8,370 | $ 10,067
Unrealized Losses, In Loss Position Less than12 months | (1,073) | (476)
Fair market value, In Loss Position Greater than12 months | 8,299 | 13,733
Unrealized Losses, In Loss Position Greater than12 months | (1,279) | (2,596)
Fair market value, Total | 16,669 | 23,800
Unrealized Losses, Total | (2,352) | (3,072)
Municipal bonds |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months |  | 137
Unrealized Losses, In Loss Position Less than12 months |  | (3)
Fair market value, In Loss Position Greater than12 months |  | 0
Unrealized Losses, In Loss Position Greater than12 months |  | 0
Fair market value, Total |  | 137
Unrealized Losses, Total |  | (3)
Foreign debt |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 92 | 1,619
Unrealized Losses, In Loss Position Less than12 months | (3) | (120)
Fair market value, In Loss Position Greater than12 months | 1,128 | 1,961
Unrealized Losses, In Loss Position Greater than12 months | (131) | (315)
Fair market value, Total | 1,220 | 3,580
Unrealized Losses, Total | (134) | (435)
Corporate debt |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 2,621 | 4,679
Unrealized Losses, In Loss Position Less than12 months | (59) | (152)
Fair market value, In Loss Position Greater than12 months | 555 | 1,439
Unrealized Losses, In Loss Position Greater than12 months | (128) | (669)
Fair market value, Total | 3,176 | 6,118
Unrealized Losses, Total | (187) | (821)
Preferred stock |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months |  | 2,038
Unrealized Losses, In Loss Position Less than12 months |  | (77)
Fair market value, In Loss Position Greater than12 months |  | 8,329
Unrealized Losses, In Loss Position Greater than12 months |  | (587)
Fair market value, Total |  | 10,367
Unrealized Losses, Total |  | (664)
Preferred stock |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 29 |
Unrealized Losses, In Loss Position Less than12 months | 0 |
Fair market value, In Loss Position Greater than12 months | 5,492 |
Unrealized Losses, In Loss Position Greater than12 months | (411) |
Fair market value, Total | 5,521 |
Unrealized Losses, Total | (411) |
Mortgage-backed securities |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 76 | 31
Unrealized Losses, In Loss Position Less than12 months | (10) | (3)
Fair market value, In Loss Position Greater than12 months | 16 | 0
Unrealized Losses, In Loss Position Greater than12 months | (5) | 0
Fair market value, Total | 92 | 31
Unrealized Losses, Total | (15) | (3)
Common stock |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 5,119 | 1,563
Unrealized Losses, In Loss Position Less than12 months | (991) | (121)
Fair market value, In Loss Position Greater than12 months | 1,108 | 2,004
Unrealized Losses, In Loss Position Greater than12 months | (604) | (1,025)
Fair market value, Total | 6,227 | 3,567
Unrealized Losses, Total | (1,595) | $ (1,146)
Mutual Fund [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Fair market value, In Loss Position Less than12 months | 433 |
Unrealized Losses, In Loss Position Less than12 months | (10) |
Fair market value, In Loss Position Greater than12 months | 0 |
Unrealized Losses, In Loss Position Greater than12 months | 0 |
Fair market value, Total | 433 |
Unrealized Losses, Total | $ (10) |

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