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Cemetery Perpetual Care Trust Investments (Unrealized losses on perpetual care trust investments) (Details) - Perpetual Care Trust Invesments [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 20,267 | $ 8,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,372) | (1,073)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 5,885 | 8,299
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,727) | (1,279)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 26,152 | 16,669
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3,099) | (2,352)
Foreign Debt [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,262 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (24) | (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 769 | 1,128
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (77) | (131)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,031 | 1,220
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (101) | (134)
Corporate Debt Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 5,878 | 2,621
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (211) | (59)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 314 | 555
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (137) | (128)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6,192 | 3,176
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (348) | (187)
Common Stock [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 9,266 | 5,119
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,045) | (991)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,647 | 1,108
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,239) | (604)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 10,913 | 6,227
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,284) | (1,595)
Preferred Stock [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,861 | 29
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (92) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,114 | 5,492
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (267) | (411)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6,975 | 5,521
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (359) | (411)
Mortgage Backed Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 76
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 41 | 16
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7) | (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 41 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (7) | (15)
Mutual Fund [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 433
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 433
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (10)

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