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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 | Mar. 31, 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 | $ 16,355 | $ 8,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,901) | (1,073)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 8,432 | 8,299
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,700) | (1,279)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 24,787 | 16,669
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3,601) | (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 | 318 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (11) | (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,110 | 1,128
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (157) | (131)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,428 | 1,220
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (168) | (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 | 4,637 | 2,621
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (289) | (59)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 576 | 555
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (141) | (128)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,213 | 3,176
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (430) | (187)
Common Stock [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 7,291 | 5,119
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,534) | (991)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,079 | 1,108
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (894) | (604)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 8,370 | 6,227
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,428) | (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 | 3,423 | 29
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (32) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 5,622 | 5,492
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (492) | (411)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 9,045 | 5,521
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (524) | (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 | 45 | 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 | 45 | 16
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (16) | (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 90 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (16) | (15)
Mutual Fund [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 641 | 433
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (35) | (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 641 | 433
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (35) | $ (10)

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